| Model | C/N | Built | ID / History |
| s-51 w/o Mod.in Org | 51-17 | 1947 | G-AJHW: One of six S-51s imported by Westlands for evaluation and to seed the Dragonfly programme. To UK Admiralty for trials. 
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| westminster | wa1  | 1958 | G-APLE: ff 15 Jun 1958, registered as G-APLE 27 Feb 1959. De-registered 29 Sep 1960 and scrapped by Coley.
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| saro p.531 | s2/5267 | 1958 | G-APNU: P.531 O/N built at Eastleigh, ff 20 Jul 1958. 1st prototype, with 400shp Turbomeca Turmo 603 derated to 325 shp. To UK R ...
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| saro p.531 | s2/5268 | 1958 | G-APNV: P.531-1 built at Eastleigh, ff 30 Sep 1958. 2nd prototype, also with 400shp Turbomeca Turmo 603 derated to 325 shp. To U ...
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| widgeon w/o Mod.in Org | wa/h/001 | 1948 | G-APPR: ex G-AKTW. Originally built as a Dragonfly and was 2nd convertion to a Widgeon, during 1958. Re-registered as G-APPR Oct ...
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| widgeon w/o Mod.in Org | wa/h/003 | 1949 | G-APPS: ex G-ALIK. Originally built as a Dragonfly and was 1st conversion to a Widgeon, during early 1958. Re-registered as G-AP ...
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| westminster | wa2 | 1959 | G-APTX: Registered as G-APTX 5 May 1959, ff 4 Sep 1959. wfu Sep 1962 and scrapped by Coley.
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| saro p.531 | s2/5311 | 1959 | G-APVL: P.531-2 as second tranche of prototype, with 1050shp Bristol Siddeley Nimbus engine derated to 635shp. ff 9 Aug 1959. T ...
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| saro p.531 | s2/5312 | 1959 | G-APVM: P.531-2 built at Eastleigh as second tranche of prototype, with de Havilland Gnome H.1000 turbine derated to 685shp. ff ...
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| sea king w/o Mod.in Org | wa 951 | 1985 | IN514: ex ZF527. Ditched in Mediterranean Sea near St. Raphael, during sonar dipping trials and w/o 23 Jul 1987, before deliver ...
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| eh.101 merlin w/o Mod.in Org | 50004 | 1989 | PP4: First flew on 15 June 1989 at Yeovil. Used mainly for overwater navigation system trails and AFCS development. Crashed ...
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| eh.101 merlin w/o Mod.in Org | 50005 | 1989 | PP5: First standard Naval Merlin used in sea trails on HMS Norfolk and HMS Iron Duke. Carried military serial of ZF649
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| s-58 | 58-265 | 1956 | XL722: Ex USN 141602. Delivered by sea, re-assembled at the dockside and flown to Yeovil 24 Jun 1956 as G-17-1. XL722 in Jul 19 ...
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| saro p.531 | s2/5270 | 1958 | XN334: P.531 O/N built at Eastleigh, to UK Royal Navy for trials.
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| saro p.531 | s2/8444 | 1961 | XR436: P.531-2 built at Hayes, for evaluation by Indian Government. ff Feb 1962. Indian interest waned and airframe diverted f ...
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| s-61 h-3 | 61-395 | 1966 | XV372: Built as Sikorsky Sea King HAS.1. Used as pattern airframe for Westland pr ...
XV372: w/o 15 Jan 1969 near West Harptree, Somerset when both engines stopped in bad weather, following ice ingestion while ope ...
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| blackhawk | 70.1058 | 1989 | ZG468: As G-17-70 for sales and promotional purposes, until sold to Bahrain in 1996. ...
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| eh.101 merlin w/o Mod.in Org | 50003 | 1988 | ZH647 G-: PP3 undertook its first flight on 30 Sept 1988, used by westlands as a commercial development airframe. Can now be seen ...
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