| 21 High Street, Camberley, Surrey, England |
| 21 High Street, Westerham, Kent, England |
| 21 Holywell Hill, St. Albans, Hertfordshire, England |
| 21 Jermyn Street, London, England |
| 21 Kenway Road, Earl's Court, London, England |
| 21 Little Clarendon Street, Oxford, England |
| 21 Lower Belgrave Street, S.W., London, England |
| 21 Mansion Mews, Queen's Gate, London, England |
| 21 Market Street, Tavistock, Devon, England |
| 21 Market Street, Bradford-on-Avon, England |
| 21 Meeting House Lane, Brighton, Sussex, England |
| 21 Molesworth Street, Dublin, Ireland |
| 21 Mortimer Street, W.1, London, England |
| 21 Newtownards Road Upper, Belfast, Northern Ireland |
| 21 Normandy Street, Alton, Hampshire, England |
| 21 North End Road, W.14, London, England |
| 21 Old Bond Street, W, London, England |
| 21 Orchard Street, W, London, England |
| 21 Oxford Street W., London, England |
| 21 Paddington Street, W1, London, England |