Aa
Abercynon Special Constabulary
Aberdare Canal Police
Aberdeen City Police
Aberdeen Harbour Police
Aberdeen Railway Police
Aberdeenshire Constabulary
Abergavenny & Brecon Canal Police
Abergavenny Police
Aberystwyth Police
Abingdon Borough Police
Accrington Borough Police
ACPO
Admiralty Civil Police
Admiralty Constabulary

AEA Constabulary
Aer Rianta Airport Police Fire Service
Air Force Department Constabulary
Air Force Police (Royal)
Air Ministry Constabulary
Air Ministry Warders
Air Raid Precautions
Airbourne Law Enforcement Association
Airdrie Burgh Police
Airdrie Rural Police
Aire & Calder Navigation Police
Airport Police
Airport Police Belfast
Airport Police Birmingham
Airport Police East Midlands
Airport Police Glasgow

Airport Police Liverpool
Airport Police Manchester
Airport Police Newcastle
Airport Police Service
Alexandra Dock & Railway Police
Allerdale-above-Derwent Police
Alloa Burgh Police
Anderston Burgh Police
Andover Borough Police

Anglesey Constabulary
Angus Constabulary
Annan Burgh Police
APS
Arbroath Burgh Police
Ardrossan Burgh Police
Argyllshire Constabulary
Army Department Constabulary
ARP
Arundel Borough Police
Ashton-under-Lyne Borough Police
Association of Chief Police Officers
Auxiliary Messenger Service
Avon & Somerset Constabulary
Ayr Burgh Police
Ayrshire Constabulary