A list of aircraft operators that have that have suffered an accident, serious incident or hijacking. The list may also contain defunct airlines or airlines that in the meantime have changed their name or have merged.

Eagle Aircraft Services

Airlines:
Aerocharter Midlands
Air Bridge Carriers (renamed Hunting Cargo Airlines 1992 and then changed to Air Contractors,)
Air Charter Ltd.
Air Ecosse
Air Ferry
Air Furness
Air Safaris (started as Meredith Air Transport in 1952)
Air Transport Charter
Air UK (merger of BIA and Air Anglia as well as Air Wales and Air Westward)
Air UK Leisure (a subsidiary of AirUK)
Air West
Airtours International (renamed My Travel Airways, May 2002)
Airwork (merged with Hunting Clan into BUA)
Alidair
Aquila Airways
Atlantic Airlines Ltd.
Autair International Airways (originally named Argus Air Transport; became Autair (Luton) in 1960; named Autair International Airways in 1963 and Court Line in 1970)
BA CityFlyer
BAC Charter
BKS Air Transport (became wholly owned by BEA and changed it's name to Northeast)
bmi British Midland
Britannia Airways (rebranded as Thomsonfly in 2005)
Britavia (acquired by BUA)
British Air Ferries - BAF (fomerly BUAF, named BAF in 1967; renamed British World Airways, 1993)
British Airtours (renamed Caledonian Airways)
British Airways
British Airways Express
British Airways Ltd. (formed in 1935 by the merger of Spartan Air Lines Ltd, United Airways Ltd)
British Caledonian Airways
British Eagle International Airlines
British European Airways - BEA (now operates as British Airways)
British Island Airways - BIA
British Midland Airways - BMA (rebranded bmi - British Midland International)
British Overseas Airways Corporation - BOAC (merged with British European Airways to form British Airways)
British Regional Airlines (merged with Brymon Airways to create British Airways CitiExpress)
British South American Airways - BSAA (merged back into BOAC)
British United Air Ferries (became British Air Ferries in 1967)
British United Airways - BUA
British World Airways
Caledonian Airways (merged with British United Airways (BUA))
Cambrian Airways (incorporated into British Airways)
Channel Air Bridge
Channel Airways
Channel Express (rebranded to become Jet2.com)
CityFlyer Express (merged into British Airways)
Court Line Aviation
Crewsair
Cunard Eagle Airways (Founded as Eagle Aviation; renamed Cunard Eagle in 1960; renamed British Eagle International Airlines, 1963)
Dan-Air Services
Derby Aviation (renamed British Midland Airways (BMA), 1964)
Don Everall Aviation (acquired by Air Safaris, 1960)
Eagle Aviation Ltd. (renamed Cunard Eagle Airways, 1960)
East Anglian Flying Services (renamed Channel Airways in 1962)
Eastern Airways
easyJet
Emerald Airways
Euroair
Euroceltic Airways
Excalibur Airways
Fairflight
Falcon Airways
Flight Refuelling
Flybe (formerly British European)
GAMA Aviation
Gibraltar Airways (renamed GB Airways)
Gill Air
Guernsey Airlines
Handley Page Transport
Harvest Air
Heavylift Cargo Airlines
Highland Airways
Hunting Air Transport
Hunting Air Travel (renamed Hunting Air Transport (1951), later Hunting-Clan (1953))
Hunting-Clan Air Transport (merged with Airwork into BUA)
IAS Cargo
Imperial Airways (merged with British Airways Ltd. into BOAC, November 1939)
Independent Air Travel
Invicta International Airways
Jersey Airlines
Jersey Airways (integrated into BEA)
Jersey European Airways (rebranded as British European)
Knight Air (sold routes to move on in engineering business)
Kondair
Lancashire Aircraft Corp
Lanzair
Links Air
Lloyd International Airways
Loganair
Manx Airlines
Manx2
Metropolitan Air Movements
Monarch Airlines
National Airways (UK)
Northern Executive Aviation
Overseas Aviation
Phoenix Aviation Ltd
Railway Air Services
Redcoat Air Cargo
Scot Airways
Scottish Airlines
Scottish Aviation
Silver City Airways
Skyways
Skyways Cargo Airline
Skyways Coach Air
Smiths Aviation
Southampton Air Services
Starways (taken over by British Eagle)
Streamline Aviation (integrated into Emerald Airways)
Surrey Flying Service
Thomas Cook Airlines (formerly JMC Airlines)
Thomson Airways (formerly Britannia Airways and Thomsonfly/First Choice Airways)
Titan Airways
Tradewinds Airways
Trans Europe Air Charter (presumably ceased operations 1984)
Transmeridian Air Cargo
Virgin Atlantic Airways

Corporations:
Artix
Brencham Ltd
British Steel Corp.
Frandley Aviation Partnership
Imperial Tobacco Group
Marchwiel Plant & Engineering
Penarth Commercial Properties
R.A. Brand & Co. Ltd.
Regency Projects
Slender You Ltd.
Trygon

Flying schools, Aeroclubs, Paraclubs:
Army Parachute Association
Empire Test Pilots School
North-West Parachute Centre
Peterborough Parachute Centre

Government:
UK Ministry of Supply

Manufacturers:
Avcen
Avro (merged into Hawker Siddeley Aircraft 1963)
Bristol Aeroplane Company (merged with several major British aircraft companies to form the British Aircraft Corporation (BAC))
British Aerospace (merger of the British Aircraft Corporation, Hawker Siddeley Aviation, Hawker Siddeley Dynamics and Scottish Aviation.)
British Aircraft Corporation - BAC (merger of English Electric Aviation Ltd., Vickers-Armstrongs (Aircraft), the Bristol Aeroplane Company and Hunting Aircraft)
Britten-Norman
Handley Page Ltd
Hawker Siddeley Aviation
Short Brothers
Vickers-Armstrongs Ltd

Military:
Aeroplane and Armament Experimental Establishment
Army Air Corps - AAC
Royal Air Force - RAF
Royal Aircraft Establishment - RAE (become part of the new Defence Research Agency in 1991)
Royal Navy - Fleet Air Arm (FAA)

Organisations (non-profit):
British Antarctic Survey
Leicester Aircraft Preservation
Mrs 4000 Investments Ltd
Plane Sailing

Private:
Brand
D. Owen
R. Warren Davies
S. Macey
V.H. Bellamy
William Dempster

Special operations (survey, crop spraying etc.):
Hunting Aerosurveys (merged with Hunting Geophysics to become Hunting Surveys Ltd in 1960)
Hunting Surveys (formerly Hunting Aerosurveys)
National Aviation Displays