| Banbury | England | E14001072 |
| Bangor Aberconwy | Wales | W07000083 |
| Barking | England | E14001073 |
| Barnsley North | England | E14001074 |
| Barnsley South | England | E14001075 |
| Barrow and Furness | England | E14001076 |
| Basildon and Billericay | England | E14001077 |
| Basingstoke | England | E14001078 |
| Bassetlaw | England | E14001079 |
| Bath | England | E14001080 |
| Bathgate and Linlithgow | Scotland | S14000068 |
| Battersea | England | E14001081 |
| Beaconsfield | England | E14001082 |
| Beckenham and Penge | England | E14001083 |
| Bedford | England | E14001084 |
| Belfast East | Northern Ireland | N05000001 |
| Belfast North | Northern Ireland | N05000002 |
| Belfast South and Mid Down | Northern Ireland | N05000003 |
| Belfast West | Northern Ireland | N05000004 |
| Bermondsey and Old Southwark | England | E14001085 |
| Berwickshire, Roxburgh and Selkirk | Scotland | S14000108 |
| Bethnal Green and Stepney | England | E14001086 |
| Beverley and Holderness | England | E14001087 |
| Bexhill and Battle | England | E14001088 |
| Bexleyheath and Crayford | England | E14001089 |
| Bicester and Woodstock | England | E14001090 |
| Birkenhead | England | E14001091 |
| Birmingham Edgbaston | England | E14001092 |
| Birmingham Erdington | England | E14001093 |
| Birmingham Hall Green and Moseley | England | E14001094 |
| Birmingham Hodge Hill and Solihull North | England | E14001095 |
| Birmingham Ladywood | England | E14001096 |
| Birmingham Northfield | England | E14001097 |
| Birmingham Perry Barr | England | E14001098 |
| Birmingham Selly Oak | England | E14001099 |
| Birmingham Yardley | England | E14001100 |
| Bishop Auckland | England | E14001101 |
| Blackburn | England | E14001102 |
| Blackley and Middleton South | England | E14001103 |
| Blackpool North and Fleetwood | England | E14001104 |
| Blackpool South | England | E14001105 |
| Blaenau Gwent and Rhymney | Wales | W07000084 |
| Blaydon and Consett | England | E14001106 |
| Blyth and Ashington | England | E14001107 |
| Bognor Regis and Littlehampton | England | E14001108 |
| Bolsover | England | E14001109 |
| Bolton North East | England | E14001110 |
| Bolton South and Walkden | England | E14001111 |
| Bolton West | England | E14001112 |
| Bootle | England | E14001113 |
| Boston and Skegness | England | E14001114 |
| Bournemouth East | England | E14001115 |
| Bournemouth West | England | E14001116 |
| Bracknell | England | E14001117 |
| Bradford East | England | E14001118 |
| Bradford South | England | E14001119 |
| Bradford West | England | E14001120 |
| Braintree | England | E14001121 |
| Brecon, Radnor and Cwm Tawe | Wales | W07000085 |
| Brent East | England | E14001122 |
| Brent West | England | E14001123 |
| Brentford and Isleworth | England | E14001124 |
| Brentwood and Ongar | England | E14001125 |
| Bridgend | Wales | W07000086 |
| Bridgwater | England | E14001126 |
| Bridlington and The Wolds | England | E14001127 |
| Brigg and Immingham | England | E14001128 |
| Brighton Kemptown and Peacehaven | England | E14001129 |
| Brighton Pavilion | England | E14001130 |
| Bristol Central | England | E14001131 |
| Bristol East | England | E14001132 |
| Bristol North East | England | E14001133 |
| Bristol North West | England | E14001134 |
| Bristol South | England | E14001135 |
| Broadland and Fakenham | England | E14001136 |
| Bromley and Biggin Hill | England | E14001137 |
| Bromsgrove | England | E14001138 |
| Broxbourne | England | E14001139 |
| Broxtowe | England | E14001140 |
| Buckingham and Bletchley | England | E14001141 |
| Burnley | England | E14001142 |
| Burton and Uttoxeter | England | E14001143 |
| Bury North | England | E14001144 |
| Bury South | England | E14001145 |
| Bury St Edmunds and Stowmarket | England | E14001146 |