| Country | Action | Action Date | Effective Date |
|---|
| Aden Protectorate | Extension | 21/02/1957 | |
| Anguilla | Extension | 21/02/1957 | |
| Barbados | Extension | 21/02/1957 | |
| British Virgin Islands | Extension | 21/02/1957 | |
| Gambia | Extension | 21/02/1957 | |
| Gibraltar | Extension | 21/02/1957 | |
| Gold Coast | Extension | 21/02/1957 | |
| Jamaica | Extension | 21/02/1957 | |
| Malay States, Federated | Extension | 21/02/1957 | |
| Malta | Extension | 21/02/1957 | |
| Mauritius | Extension | 21/02/1957 | |
| Montserrat | Extension | 21/02/1957 | |
| PARAGUAY | Signed | 21/11/1955 | 28/06/1956 |
| Seychelles | Extension | 12/04/1857 | |
| Sierra Leone | Extension | 21/02/1957 | |
| Singapore | Extension | 21/02/1957 | |
| St Helena | Extension | 21/02/1957 | |
| Tanganyika | Extension | 21/02/1957 | |
| Trinidad And Tobago | Extension | 21/02/1957 | |
| Uganda | Extension | 21/02/1957 | |
| UNITED KINGDOM | Signed | 21/11/1955 | 28/06/1956 |
| Windward Islands | Extension | 21/02/1957 | |