55 open producers
- Abbey, Bath, Somerset
- Abbeydale, Sheffield, South Yorkshire
- Abbey Ford, Chertsey, Surrey
- Abraham Thompson, Barrow in Furness, Cumbria
- Acorn, Wombwell, Barnsley, South Yorkshire
- Acton's , Macreddin Village, Wicklow
- Adkin, Wantage, Oxfordshire
- Adnams, Southwold, Suffolk
- Adur, Steyning, West Sussex
- Adventure, Chessington, Greater London
- Alcazar, Old Basford, Nottinghamshire
- Alchemist, Loughborough, Leicestershire
- Alechemy, Livingstone, West Lothian
- Ales of Scilly, St. Mary's, Scilly Isles
- Alfred's, Winchester, Hampshire
- Allendale, Allendale Town, Hexham, Northumberland
- AllGates, Wigan, Greater Manchester
- All Hallows, Goodmanham, York, East Yorkshire
- Alliance, Hambledon, Waterlooville, Hampshire
- All Saints, Scorrier, Redruth, Cornwall
- Alnwick, Alnwick, Northumbria
- Amber, Pentrich, Ripley, Derbyshire
- Anarchy, Stannington, Morpeth, Northumberland
- Anchor Springs, Wick, Littlehampton, West Sussex
- Andrew's Ales, Cummertrees, Dumfries & Galloway
- Andwell, Andwell, Hook, Hampshire
- Angel, Halesowen, Worcestershire
- Ansell's, Alston Cross, Birmingham, West Midlands
- Anspach & Hobday, London, Greater London
- An Teallach, Dundonnell, Garve, Ross & Cromarty
- Appleford, Brightwell-cum-Sotwell, Wallingford, Oxfordshire
- Árainn Mhór, Árainn Mhór Island, Burtonport, County Donegal
- Arbor Ales, Kingswood, Bristol, Bristol
- Archer's, Churchward, Swindon, Wiltshire
- Ards, Newtonards, County Down
- Argyll, Oban, Argyll & Bute
- Arkell's, Kingsdown, Swindon, Wiltshire
- Arkwright's, Preston, Lancashire
- Arran, Cladach, Brodick, Ayrshire & Arran
- Arrow, Kington, Herefordshire
- Art Brew, Chideock, Bridport, Dorset
- Artisan, Cardiff, South Glamorgan
- Arundel, Ford, West Sussex
- Ascot, Camberley, Surrey
- Ashley Down, Bristol
- Ashover, Ashover, Chesterfield, Derbyshire
- Atlantic, Tresiaac, Newquay, Cornwall
- Atlas, Kinlochleven, Inverness
- Atlas Mill, Brighouse, West Yorkshire
- Atomic, Rugby, Warwickshire
- Attwood, Hartlebury, Kidderminster, Worcestershire
- Austendyke Ales, Spalding, Lincolnshire
- Axholme, Luddington, Scunthorpe, Lincolnshire
- Aylesbury Brewhouse, Brill, Aylesbury, Buckinghamshire
- Ayr, Ayr, Ayrshire & Arran
43 closed producers
- Abbey, Lound, Retford, Nottinghamshire
- Abbey Bells, Hirst Courtney, Selby, North Yorkshire
- ABC, Abingdon, Oxfordshire
- ABC, Aston, Birmingham, West Midlands
- Abel Brown, Stotfold, Bedfordshire
- Aberdeenshire, Drumwhindle, Aberdeenshire
- Aberystwyth, Llanrhystud, Aberystwyth, Dyfed
- Abigale, Ashford, Kent
- Abington Park, Northampton, Northamptonshire
- Afan, Port Talbot, West Glamorgan
- Airedale, Castleford, West Yorkshire
- Aitken,
- Alchemy, Hersham, Surrey
- Aldchlappie, Kirkmichael, Perth & Kinross
- Ale House, Leeds, West Yorkshire
- Ales of Kent, Ovington, Richmond, County Durham
- Ales of the Unexpected, Atherstone, Nuneaton, Warwickshire
- Alewife, Starston, Harleston, Norfolk
- Alexandra Arms, Rugby, Warwickshire
- Alexandria, Portslade, East Sussex
- Alford Arms, Frithsden, Hertfordshire
- Alice, Inverness, Inverness
- All Nations, Madeley, Shropshire
- Alloa, Alloa, Clackmannanshire
- All Saints, Stamford, Lincolnshire
- Althorpe's Coaching Inn, Great Brinington, Northamptonshire
- Altrincham, Lymm, Cheshire
- Ancient Druids, Cambridge, Cambridgeshire
- Anglo-Dutch, Dewsbury, West Yorkshire
- Angus, Carnoustie, Angus
- Ann Street, St Helier, Jersey
- Archibold Arrol, Alloa, Clackmannanshire
- Argyle, Leith, Edinburgh, Lothian
- Ashford, Ashford, Kent
- Ash Vine,
- Ash Vine, Trudoxhill, Somerset
- Aston Manor, Aston, West Midlands
- Avon, Bristol, Bristol
- AVS,
- Axe Vale, Colyton, Devon
- Axminster, Fordwater, Axminster, Devon
- Aylesbury, Aylesbury, Oxfordshire
- Ayrshire, Lugton, Strathclyde