Sides beginning with letter "B"
Sides without Web sites are now listed. Colours: Open, Ring, FederationCarnival Morris Troups are marked in pink!
Updated: 
I cannot guarantee that these are all the B's, but they have been checked! Try Google!
Babylon, Corscombe, DORSET
Bakanalia Border Morris, Leicester, Leicestershire
(Mr) Baker's Dozen, Isle of Wight
Baldock Midnight Morris, Baldock, Hertfordshire
The Traditional Bampton Morris Dancers: Woodley/now Adams side
Bampton Morris Dancers: Shergold/now Daniels Side
Banchory Ternan Morris Men Aberdeen, Grampian, Scotland
Bare Bones Border Morris, Loughborough
Barley Break, Grimsby
Barley Brigg, Westleton
Barnsley Longsword, Barnsley, South Yorkshire
Basingclog, Basingstoke, Hampshire
Bathampton Morris Men, Bath, Somerset
Bath City Morris 1967-1997(?) Tribute Page
Bean Setting Jacks, Zeist, Utrecht, Netherlands
Beaux of London City
Bedford Morris Men, Bedfordshire
Bedfordshire Lace, Ampthill, Bedfordshire
Bedcote Morris, Stourbridge, West Midlands
Beetlecrushers, Bath, Somerset
Beggar's Oak Clog, Armitage, Staffordshire
Belchamp Morris Men, Belchamp St. Paul, Suffolk
Belfagan Women's Morris, Cockermouth, Cumbria
Belles and Arrows Morris, Portsmouth/Fareham, HAMPSHIRE Were South Sea Belles, joined up with Arrowhead, to form BAM(!)
Belle d'Vain, Evesham, Warwickshire
Belles & Broomsticks, St Peters, Guernsey
The Belles of London City, Cecil Sharp House, London
Beltane Border Morris, Stokeinteignhead, Devon
Benfieldside Morris and Sword Dancers, Chester-Le-Street, Co Durham
Benskins Morris, Watford, Herts
Berkshire Bedlam, Wokingham, Berkshire
Betty Lupton's Ladle Laikers, Harrogate, North Yorkshire
Beverley Garland Dancers, Hull {Or find under Clubs and Societies}
Bideford Phoenix Morris, Bideford, Devon
The Big Caper
Bishop's Bedlam, (Durham University Folk Society, Rapper Sword)
Bishop Gundulf's Morris; Rochester; KENT
Bishopstone Union of Morris Men, Swindon. Worth a Tweet! Else Google them.
Bishopswood Mummers, Taunton, SOMERSET
Blackawton Morris, Totnes, Devon. Then look under dance groups.
Black Adder Rapper and Step Cotteridge, Birmingham.
Black Annis, Leicester. Or find under Clubs and Societies.
Black Bess Border, Kingskerswell, Devon
Black Boy Rapper, Mistley, Essex. Look down list.
Black Bull Border Morris, Lincolnshire. Look down list.
Blackheath Morris Men
Black Dog Molly Stoke on Trent, Staffs
Black Horse & Standard NW, Ilford, Essex
Black Jack Border Morris, Bretforton, Nr Evesham, Worcs.
Blackmore Morris Men, Blackmore, ESSEX
Black Pig Border Morris, Annesley Woodhouse, Nottinghamshire
Black Sheep Morris Barnard Castle, Durham
Black Skunk Morris, Norwich, Norfolk
Black Swan Rapper, York / Leeds. See also Facebook
Bloxham Morris, Bloxham, Oxfordshire
Bluefields
Bog Hoppers & Bushbeaters, Milford-on-Sea, Dorset
Boggart's Breakfast, Sheffield; SOUTH YORKSHIRE
Boar's Head Morris Men, Bradford, W. Yorks.
Bollin Morris, Altrincham, Cheshire
Bodicote Morris (Rhubarb Fumble), Oxfordshire
Boojum, Rapper Side, members from various parts of the UK
Border Dash, Leigh on Sea, Essex
Borderline Morris Reading Area, Berkshire
Boughton Monchelsea Morris, Maidstone, Kent
Bourne Borderers Morris, Bourne, Lincolnshire
Bourne Bumpers, Bournemouth.
Bourne River Morris Bournemouth, Hampshire
Bows 'n' Belles, Colchester, Essex
Brackley Morris Men, Brackley, Northamptonshire
Bradshaw Mummers
Braybrooke Morris
Breinton Morris Men (Archive 1977-1997), Breignton
Brethren Border Morris, King's Heath, Birmingham
Briggate Morris, Leeds, West Yorkshire
Brighton Morris Men, Brighton, Sussex
Bristol Morris Men [The Splendid], Bristol
Britannia Coconut Dancers
Broadwood Sword & Morris Men, Horsham, WEST SUSSEX
Buckland Shag Morris Men, Reigate, Surrey
Bullnose Morris, Basildon, Essex
Bury Fair
Bury Pace Eggers, Bury, Lancs
Buttercross Belles, Otley, W.Yorks