Political organisations
| Name | Type | Notes |
|---|---|---|
| British Council for International Understanding | Pressure group | |
| British & Foreign Bible Society | Religious | |
| British League of Ex-Servicemen | Miscellaneous | |
| British Legion | Miscellaneous | |
| British Medical Association | Pressure group | BMA |
| British Sailing Ship Owners Association | Pressure group | |
| British Steamship Owners Association | Trade group | |
| British Union of Family Organisations | Miscellaneous | |
| British Wool Marketing Board | Miscellaneous | |
| British Workers' League | Pressure group | |
| Buckinghamshire Chamber of Agriculture | Miscellaneous | |
| Budget League | Miscellaneous | |
| Cambridge Union | Miscellaneous | |
| Campaign for Europe | Miscellaneous | |
| Campaign for European Political Community | Pressure group | |
| Campaign for Labour Party Democracy | Party group | |
| Campaign for Nuclear Disarmament | Pressure group | |
| Campaign for Welsh Assembly | Pressure group | |
| Canine Consultative Council | Miscellaneous | |
| Canterbury Farmers' Club | Trade group |