Trade unions
| Full Name | Short Name | Notes |
|---|---|---|
| Connect | Connect | |
| Conservative Trade Union Association | Cons TU | |
| Constructional Engineering Union | CEU | |
| Co-operative | Co-op | |
| Co-op Party (sponsorship) | Co-op | |
| DATA | DATA | |
| Derbyshire Miners' Association | DeMA | |
| Dock, Wharf, Riverside and General Workers' Union | DWRGWU | |
| Draughtsmans | DATA | Draughtsmans Union |
| Draughtsman's Union | DATA | |
| Durham Colliery Mechanics' Association | DCMA | |
| Durham Miners Association | DMA | |
| Educational Institute of Scotland | EIS | |
| Electrical Engineers and Plumbing Trades Union | EEPTU | check full name |
| Electrical Power and Engineering Association | EPEA | check exact terms |
| Electrical Trades Union | ETU | |
| Electrical Trades Union | ETU | |
| Electrical Union (check full name) | EPU | |
| Engineering and Fastener Trade Union | EFTU | |
| Engineers' and Managers Association | EMA |