|  Unit | 
 Dates | 
 Aircraft | 
 Base | 
 Notes | 
| 226 OCU  | 
Aug 46–Aug 49 Sep 49–Jun 55 Jun 63–Sep 74 Oct 74–Sep 91 | 
Oxford I, Beaufighter X Hornet F.1 Mosquito III/TT.35 Tiger Moth II Vampire F.1/FB.5/T.11 Meteor F.3/F.4/T.7/F.8/FR.9 Tempest II Martinet I Spitfire XIV/XVI/XVIII/XIX/F.22 Javelin T.3 Lightning F.1/F.1A/F.3/T.4/T.5 Jaguar GR.1/T.2 | 
RAF Molesworth RAF Bentwaters RAF Driffield RAF Stradishall RAF Middleton St. George RAF Coltishall RAF Lossiemouth | 
Formed at Molesworth by re-designating 1335 (Meteor) CU. Disbanded at Driffield to become 203 AFS. Re-formed at Stradishall by renaming 203 AFS. Re-formed at Middleton St. George by merging the Lightning Conversion Squadron and the Fighter Command Instrument Rating Squadron. Disbanded at Coltishall. Immediately re-formed at Lossiemouth by re-designating the Jaguar Operational Conversion Unit. Disbanded at Lossiemouth to become 16 (Reserve) Sqn | 
227 OCU 227 (AOP) CU | 
May 47–Dec 47 Dec 47–May 50 | 
 Tiger Moth II Oxford I Auster V Auster VI Auster T.7 Auster A.2/45 Harvard IIB  | 
 RAF Andover RAF Middle Wallop | 
Formed by re-designation of No. 43 OTU Became the Air Observation Post School. | 
| 228 OCU | 
May 47–Sep 61 May 65–Dec 66 Aug 68–Jul 92 | 
Martinet I Master II Oxford I Tiger Moth II Brigand B.1/T.4/T.5 Tempest V Buckmaster T.1 Wellington XVIII Mosquito III/VI/NF.30/TT.35/NF.36 Balliol T.2 Valetta C.1/T.3/T.4 Prentice T.1 Vampire T.11 Meteor F.4/T.7/NF.11/NF.12/NF.14 Anson XIX Chipmunk T.10 Javelin T.3/FAW.5/FAW.7/FAW.9 Canberra T.4/T.11 Phantom FGR.2 Jet Provost T.4  | 
RAF Leeming RAF Leuchars RAF Coningsby   | 
Formed by merging No. 13 OTU and No. 54 OTU Became 64 (R) Sqn | 
| 229 OCU | 
Dec 50–Sep 74 Nov 84–Jul 92 | 
Vampire FB.5/T.11 Meteor T.7/F.8/TT.8 Hunter F.1/F.4/F.6/T.7/FGA.9/FR.10 Tempest V Beaufighter X Oxford I/II Mosquito III/TT.35 Martinet I Anson T.21/T.22 Sabre F.2/F.4 Chipmunk T.10 Jet Provost T.3A Tornado F.2(T)/F.3  | 
 RAF Leuchars RAF Chivenor RAF Brawdy RAF Coningsby   | 
Formed from 'B' and 'D' Flights of 226 OCU. Reformed 1957 at Chivenor, still there late 1962. Relocated to RAF Brawdy mid 1960s Disbanded 2 September 1974 at Brawdy to become the Tactical Weapons Unit Designated 65 (Shadow) Squadron from 31 December 1986 Became 56 (R) Sqn. | 
| 230 OCU | 
Mar 47–Oct 52 Aug 53–Feb 55 May 56–Aug 81 | 
Lancaster I/III Lincoln B.2 Mosquito III/B.35/NF.36 Tiger Moth Anson XIX Vulcan B.1/B.2 Hastings T.5 Canberra T.4 | 
 RAF Lindholme RAF Scampton RAF Upwood RAF Waddington RAF Finningley RAF Scampton  | 
Formed by re-designting 1653 HCU Disbanded 15 October 1952 to become the Reserve Training Squadron Became the Lincoln Conversion Flight at Upwood 1 February 1955. | 
| 231 OCU | 
Mar 47–Dec 49 Dec 51–Dec 90 May 1991–Apr 93 | 
Lancaster I/III Anson XII/XIX/T.22 Mosquito III/VI/XVI/PR.34/PR.34A/B.35 Chipmunk T.10 Meteor T.7/PR.10 Canberra B.2/PR.3/T.4   | 
RAF Coningsby RAF Waddington RAF Bassingbourn RAF Cottesmore RAF Marham RAF Wyton  | 
Formed by re-designating No. 16 OTU re-formed at Bassingbourn by re-designation of 237 OCU Disbanded at Wyton, 15 December 1990, to become the Canberra Standardisation and Training Flight Re-formed at Wyton 13 May 1990 from the Canberra Standardisation and Training Flight | 
| 232 OCU | 
Feb 55–Jun 65 Feb 70–Apr 86 | 
 Valiant B.1 Victor B.1/B(PR).1/B.1A/B.2/BK.2 Canberra T.4  | 
 RAF Gaydon RAF Marham  | 
At Gaydon, 30 June 1965, the Victor element became the Tanker Training Flight Re-formed at Marham 6 February 1970 by amalgamating the Victor (B.2) Training Flight and the Victor Training Unit | 
| 233 OCU | 
Sep 52–Sep 57 Oct 70–Sep 92 | 
Vampire FB.5/FB.9/T.11 Balliol T.2 Meteor T.7/F.8 Oxford I Tiger Moth II Mosquito III/PR.34A/TT.35 Tempest V Chipmunk T.10 Hunter F.1 Harrier GR.1/GR.1A/GR.3/GR.3A/T.2/T.4/T.4A/GR.5   | 
RAF Pembrey[1] RAF Wittering   | 
Became 20 (R) Sqn | 
| 235 OCU | 
Jul 47–Oct 53 | 
Sunderland V Short Seaford   | 
RAF Calshot   | 
Became the Flying Boat Training Squadron | 
| 236 OCU | 
Jul 47–Sep 56 Jul 70–Sep 92 | 
Lancaster III Oxford I/II Beaufighter X Shackleton GR.1/MR.1A Neptune MR.1 Martinet I Tiger Moth II Spitfire XVI Vampire FB.5 Anson XI/XIX Mosquito TT.35 Brigand T.5 Buckmaster T.1 Nimrod MR1 & MR2    | 
RAF Kinloss RAF St Mawgan   | 
Formed by re-designating No. 6 OTU | 
| 237 OCU | 
Jul 47–Dec 51 Oct 56–Jan 58 Mar 71–Oct 91 | 
Oxford I Mosquito III/PR.34/PR.34A Spitfire XVI/XIX Harvard IIB Meteor T.7/PR.10 Canberra PR.3/T.4 Hunter F.6/T.7/T.7A/T.7B/T.8C Buccaneer S.2A/S.2B   | 
RAF Benson RAF Bassingbourn RAF Wyton RAF Honington RAF Lossiemouth   | 
Formed by re-designating No. 8 OTU Became 231 OCU at Bassingbourn. Re-formed at Wyton, 1956, by re-designating 'C' Squadron of 231 OCU. Re-absorbed by 231 OCU January 1958. | 
| 238 OCU | 
1 Jun 52–Mar 58 | 
Buckmaster T.1 Brigand T.4/T.5 Mosquito TT.35 Balliol T.2 Meteor NF.12/NF.14 Valetta C.1/T.3     | 
RAF Colerne RAF North Luffenham   | 
Formed by re-designating the Airborne Interception School | 
| 240 OCU | 
Jan 48–Apr 51 Dec 71–Oct 93 | 
Anson I/X/XII/XIX Dakota IV Hastings MET.1 Valetta C.1 Wessex HC.2 Puma HC.1 ChinookHC.1   | 
RAF North Luffenham RAF Odiham   | 
Formed by merging 1333 (TS)CU with 1382 (T)CU | 
| 241 OCU | 
Jan 48–Apr 51 Jul 70–Oct 93 | 
York C.1 Halifax IX Hastings C.1 Valetta C.1 Tiger Moth II Anson XI/XII Brittania C.1/C.2 Andover C.1 Belfast C.1 VC10 C.1 Tristar C.1 BAe 146     | 
RAF Dishforth RAF Brize Norton   | 
Formed by re-designating 1332 HTCU. Became No. 55 (Reserve) Squadron RAF | 
| 242 OCU | 
Apr 51–Jul 92 | 
Valetta C.1 Hastings C.1/MET.1/C.1A Beverley C.1 Argosy C.1 Andover C.1 Hercules C.1/C.1K/C.1P/C.3 Tiger Moth II Anson XII Chipmunk T.10   | 
RAF Dishforth RAF Thorney Island   RAF Lyneham   | 
Became 57 (R) Sqn | 
| 1330 CU | 
Jun 44–Mar 46 | 
 Harvard IIA Baltimore IV/V Vengeance IV Hudson IIIA Expeditor I Marauder II/III Ventura V Hellcat II Beaufighter X Spitfire Vb Mustang IVA Anson I Dakota I/III Douglas DC-2 Mosquito III/IV Oxford I   | 
 RAF Bilbeis  | 
No. 1 (Middle East) Check and Conversion Unit RAF re-designated. | 
1331 CU 1331 HTCU | 
Sep 44–Jan 46 Dec 46–Jan 48 | 
 Harvard IIB Vengeance IA/II/IV Beaufighter VI/X Spitfire VIII Mustang IV Mosquito III Oxford I Blenheim V Thunderbolt I/II Hurricane IIC Wellington XVI Liberator III/VI | 
 RAF Mauripur RAF Risalpur RAF Syerston | 
Formed by re-designating Check and Conversion Flight. | 
1332 (T)HCU 1332 HTCU | 
Sep 44–May 47 May 47–Jan 48 | 
Liberator III/V /VI/VII/IX York C.1 Stirling III Halifax VII/IX Skymaster C.1 Oxford I     | 
RAF Longtown RAF Dishforth   | 
Became 241 OCU. | 
1333 (TS)CU 1333 TSCU | 
Mar 45–Jul 46 Jul 46–Jan 48 | 
Dakota III/IV Horsa I/II Halifax VII/IX Oxford II Miles Magister Tiger Moth Proctor IV Auster III   | 
RAF Leicester East RAF North Luffenham | 
Formed by re-designating No. 107 OTU Merged with 1382 (T)CU to become 240 OCU. | 
| 1334 (TS)CU | 
Apr 45–Mar 45 | 
Dakota III/IV   | 
RAF Gujrat RAF Baroda   | 
 | 
| 1335 (M)CU | 
Mar 45–Aug 46 | 
Meteor F.1/F.3 Oxford II Martinet I   | 
RAF Colerne RAF Molesworth   | 
Became 226 OCU | 
1336 (TS)CU 1336 TCU | 
Jun 45–Mar 46 | 
Dakota III   | 
RAF Welford   | 
 | 
1380 (TS)CU 1380 TCU | 
Aug 45–Jan 46 | 
Wellington X Anson I Proctor II   | 
RAF Tilstock   | 
Formed by re-designating No. 81 OTU | 
| 1381 (T)CU | 
Aug 45–Feb 48 | 
Dakota III/IV Wellington X Miles Magister Tiger Moth II Oxford I   | 
RAF Bramcote RAF Dishforth   | 
Formed by re-designating No. 105 OTU | 
| 1382 (T)CU | 
Aug 45–Jan 48 | 
Oxford I Miles Magister Dakota III/IV   | 
RAF Wymeswold RAF North Luffenham   | 
Formed by re-designating No. 108 OTU Merged with 1330 TSCU to form 240 OCU. | 
| 1383 (T)CU | 
Aug 45–Aug 46 | 
Dakota III Oxford II Halifax VII   | 
RAF Crosby-on-Eden   | 
Formed by re-designating No. 109 OTU | 
| 1384 (HT)CU | 
Nov 45–Jun 46 | 
Dakota I Oxford I York C.1   | 
RAF Ossington RAF Wethersfield   | 
Formed by re-designating No. 6 Lancaster Finishing School RAF | 
| 1385 (HTS)CU | 
Apr 46–Jun 46 | 
Stirling V Halifax VII Horsa II Oxford I   | 
RAF Wethersfield   | 
Absorbed by 1333 TSCU | 
| 1584 (HB)CU | 
Nov 43–Feb 44 | 
Liberator III   | 
RAF Kolar RAF Salbani   | 
Formed by re-designating No. 1584 (Heavy Bomber Conversion) Flight RAF. Became 1673 HCU. | 
1651 CU 1651 HCU | 
Jan 42–July 44 May 44–Mar 45 Mar 45–Jul 45 | 
Stirling I/III Lancaster I/III Oxford I Spitfire Vb Tiger Moth II Beaufighter X Halifax II   | 
RAF Waterbeach RAF Wratting Common RAF Woolfox Lodge   | 
During 1942 it flew 49 operational sorties for RAF Bomber Command with a loss of five aircraft. Formed by merging No. 26 Conversion Flight RAF and No. 106 Conversion Flight RAF. Absorbed 15 Squadron Conversion Flight and 24 Squadron Conversion Flight. | 
1652 CU 1652 HCU | 
Jan 42–Jun 45 | 
Halifax I/II/III/V Spitfire Vb Hurricane IIC Spitfire Vb Hurricane IIC/IV   | 
RAF Marston Moor RAF Bentwaters   | 
During 1942 it flew 42 operational sorties for RAF Bomber Command with a loss of three aircraft. Formed by merging No. 28 Conversion Flight RAF and No. 109 Conversion Flight RAF. Absorbed  35 Squadron Conversion Flight | 
1653 CU 1653 HCU | 
Jan 42–Oct 42 Nov 43–Nov 46 | 
Liberator II Stirling I/III Lancaster I/III Blenheim IV Ventura I Mosquito XIX Hurricane IIC Spitfire Vb Beaufighter VI   | 
RAF Polebrook RAF Burn RAF Chedburgh RAF Lindholme RAF North Luffenham   | 
Formed by re-designating No. 108 Conversion Flight RAF Became No. 230 Operational Conversion Unit RAF in March 1947. | 
1654 CU 1654 HCU | 
May 42–Jul 42 Jul 42–Sep 45 | 
Manchester I Lancaster I Halifax II/V Stirling III Oxford I Hurricane IIC Spitfire Vb   | 
RAF Swinderby RAF Wigsley   | 
During 1942 it flew 12 operational sorties with a loss of two aircraft. | 
| 1655 MCU | 
Aug 42–May 43 | 
Mosquito III/IV/XVI/B.20/B.25 Blenheim IV Oxford I   | 
RAF Horsham St. Faith RAF Upper Heyford RAF Marham | 
Became Mosquito Training Unit RAF at RAF Marham   | 
| 1656 HCU | 
Oct 42–Nov 45 | 
Lancaster I/III Halifax II/V Manchester I Spitfire IIa/Vb Hurricane IIC   | 
RAF Lindholme Tiger Moth II   | 
Formed by merging 103 and 460 Squadron Conversion Fights. | 
| 1657 HCU | 
Oct 42–Dec 44 | 
Stirling I/III/IV Lancaster I/II Tomahawk IIB Oxford II Hurricane IIC   | 
RAF Stradishall   | 
Formed by merging 7, 101 and 149 Squadron Conversion Fights. | 
| 1658 HCU | 
Oct 42–Apr 45 | 
Halifax I/II/III Oxford II Hurricane IIC   | 
RAF Riccall   | 
Formed by merging 10, 76 and 78 Squadron Conversion Fights. | 
| 1659 HCU | 
Oct 42–Mar 43 Mar 43–Sep 45 | 
Halifax I/II/III Lancaster I/III Oxford II Spitfire IIa/Vb Hurricane IIC Tiger Moth   | 
RAF Leeming RAF Topcliffe   | 
Formed by merging 405 and 408 Squadron Conversion Fights. Trained Canadian aircrew. | 
| 1660 HCU | 
Oct 42–Nov 46 | 
Lancaster I/II/III Halifax II Manchester I Mosquito XIX Stirling I/III Oxford I Spitfire Vc Hurricane IIC Lysander I de Havilland Puss Moth   | 
RAF Swinderby   | 
Formed by merging 61, 97, 106 and 7 Squadron Conversion Fights. Absorbed by No. 1653 Heavy Conversion Unit RAF | 
| 1661 HCU | 
Nov 42–Aug 45 | 
Lancaster I/II Halifax II/V Manchester I Mosquito XIII Stirling III Oxford II Spitfire Vb Hurricane IIC     | 
RAF Winthorpe   | 
Formed by merging 9, 44 and 49 Squadron Conversion Fights. Short Stirlings replaced the planned re-equipment with Handley Page Halifaxs.[3] | 
| 1662 HCU | 
Jan 43–Apr 45 | 
Lancaster I/II Halifax I/II/III/V Oxford II Spitfire Vb Hurricane IIC Tiger Moth II   | 
RAF Blyton   | 
 | 
| 1663 HCU | 
Mar 43–May 45 | 
Halifax I/II/III/V Stirling I Oxford II Spitfire Vb Hurricane IIC   | 
RAF Rufforth   | 
 | 
1664 HCU 1664 (RCAF)HCU | 
May 43–Apr 44 Apr 44–Apr 45 | 
Lancaster I/III Halifax II/III/V Oxford II Spitfire Vb Hurricane IIC   | 
RAF Croft RAF Dishforth   | 
The unit had the Canadian name Caribou. | 
1665 HCU 1665 (HT)CU | 
Apr 43–Jun 43 Jun 43–Jan 44 Jan 44–Aug 45 Aug 45–Jul 46 | 
Halifax III/V/VI/VII Stirling I/III/IV Oxford II Spitfire IIa/Vb Hurricane X Tiger Moth II Mosquito VI Lancaster I     | 
RAF Mepal RAF Woolfox Lodge RAF Tilstock RAF Saltby RAF Marston Moor RAF Linton-on-Ouse   | 
Re-designated as 1665 (HT)CU on 10 August 1945 | 
1666 HCU 1666 (RCAF)HCU | 
Jun 43–Oct 43 Oct 43–Aug 45 | 
Halifax II/III/V Lancaster I/II/III Oxford II Spitfire IIa/Vb Hurricane IIC   | 
RAF Dalton RAF Wombleton   | 
The unit had the Canadian name Mohawk. | 
| 1667 HCU | 
Jun 43–Oct 43 Oct 43–Feb 44 Feb 44–Nov 45 | 
Halifax II/V Oxford II Spitfire Vb Hurricane IIC Tiger Moth II Lancaster I/III   | 
RAF Lindholme RAF Faldingworth RAF Sandtoft   | 
 | 
| 1668 HCU | 
Aug 43–Nov 43 Jul 44–Mar 46 | 
Lancaster I/II/III/X Mosquito XIX Spitfire Vb Hurricane IIC Beaufighter VI     | 
RAF Balderton RAF Bottesford   | 
Disbanded November 1943, re-formed July 1944. | 
| 1669 HCU | 
Aug 44–Mar 45 | 
Handley Page Halifax Lancaster I/III Spitfire Vb Hurricane IIC   | 
RAF Langar   | 
 | 
| 1670 (T)CU | 
Jun 44–Jan 45 | 
Thunderbolt Harvard IIB   | 
RAF Yelahanka   | 
Became 8 Refresher Flying Unit | 
| 1670 CU | 
Feb 44–Jun 44 | 
Beaufighter VI   | 
RAF Baigachi   | 
Formed from AI MkVIII Conversion Flight | 
| 1670 (M)CU | 
Feb 44–Aug 45 | 
Blenheim V Mosquito III Oxford I   | 
RAF Yelahanka   | 
 | 
| 1673 HCU | 
Feb 44–Apr 44 Apr 44–Nov 44 | 
Liberator III Tiger Moth II Anson I   | 
RAF Salbani RAF Kolar   | 
Formed by re-designating No. 1584 (Heavy Bomber) Conversion Unit RAF. | 
| 1674 HCU | 
Oct 43–Nov 45 | 
Liberator III/V/VI/VIII Halifax II Fortress I/II/IIA Wellington XIII Oxford I/II Hurricane IIC Martinet I   | 
RAF Aldergrove various bases in Northern Ireland RAF Lossiemouth   | 
 | 
| 1675 HCU | 
Oct 43–Aug 44 Aug 44–Oct 45 | 
Liberator II Harvard IIA Hurricane IIB Argus II   | 
RAF Lydda RAF Abu Sueir   | 
Formed by re-designating 5 Heavy Bomber Conversion Unit, Lydda | 
| 1678 HCU | 
Sep 43–Jun 44 | 
Lancaster II   | 
RAF Foulsham RAF Waterbeach | 
 | 
1699 (BS)CU 1699 HCU | 
Oct 44–Jun 45 | 
Fortress II/III Liberator VI Lancastrian II   | 
RAF Oulton RAF Full Sutton   | 
Became the Lancastrian Flight of No. 231 Squadron RAF | 
| All-Weather OCU | 
?–? | 
Anson T.21 Vampire T.11 Meteor T.7/F.8/NF.12/NF.14   | 
nomadic   | 
 | 
| Argosy CU | 
Nov 61–Apr 63 | 
Argosy C.1   | 
RAF Benson   | 
Became the Argosy Flight of 242 OCU | 
| Belvedere CU | 
Aug 64–Aug 68 | 
Belvedere HC.1   | 
RAF Odiham   | 
Absorbed by the Short-Range Conversion Unit | 
| Short-Range CU | 
Aug 64–Jul 67 | 
Twin Pioneer CC.2 Wessex HC.2 Auster AOP.9   | 
RAF Odiham   | 
Became the Helicopter Operational Conversion Flight | 
| Jaguar OCU | 
Jun 74–Sep 74 | 
Jaguar GR.1/T.2   | 
RAF Lossiemouth   | 
Formed from Jaguar Conversion Team. Became 226 OCU | 
| 5 Heavy Bomber Conversion Unit | 
?–? | 
Liberator   | 
[[RAF Lydda], RCAF Boundary Bay and RCAF Abbotsford]   | 
Became 1675 HCU
 In April 1944 RCAF Boundary Bay BCATP No. 5 Operational Training Unit (for Heavy Conversion) established when Seventeen B-24 Liberators were scheduled to arrive fresh from American factories that first month. However, only sixteen would actually be delivered. By Sept 30th 1944 RCAF 5 O.T.U. reported B-24 Liberators; Abbotsford 24, Boundary Bay 14, total 38. B-25 Mitchells; Boundary Bay only total 35. Bolingbrokes; Boundary Bay only total 5. P-40 Kittyhawks; Boundary Bay only 8. Norseman; Boundary Bay only 1. Total aircraft on Unit strength 87  | 
| Heavy Bomber Conversion Unit, Salbani | 
Sep 42–Jul 43 | 
Liberator III   | 
RAF Salbani   | 
Became 1584 HCU | 
| Heavy Glider Conversion Unit | 
Jul 42–Oct 44 | 
Whitley V Albemarle I/GT.I/ST.II/ST.V Horsa I/II Oxford I/II Tiger Moth II Miles Magister   | 
RAF Shrewton RAF Brize Norton   | 
Became No. 21 Heavy Glider Conversion Unit RAF | 
| 21 HGCU | 
Oct 44–Dec 47 | 
Whitley V Albemarle GT.VI Horsa I/II Oxford I Tiger Moth I Miles Magister Hotspur II/III Hadrian I Stirling IV Halifax III/VII Master II  
  | 
RAF Brize Norton RAF North Luffenham   | 
Formed by re-designation of the Heavy Glider Conversion Unit | 
| 22 HGCU | 
Oct 44–Dec 47 | 
Albemarle GT.I/ST.II/ST.V/GT.VI Horsa I/II Oxford I Hadrian I  | 
RAF Keevil RAF Blakehill Farm  | 
Formed by re-designation of an element of the Heavy Glider Conversion Unit | 
| 23 HGCU | 
Oct 44–Dec 45 | 
Albemarle GT.I/ST.V/ST.VI Horsa I/II Oxford I Hadrian I Proctor III | 
RAF Peplow | 
Formed by elements of No. 83 OTU the Heavy Glider Conversion Unit |