| Navy | The Royal Navy |
| Type | Destroyer |
| Class | Admiralty V & W |
| Pennant | L 40 |
| Built by | Scotts Shipbuilding & Engineering Co. (Greenock, Scotland) |
| Ordered | |
| Laid down | Apr, 1917 |
| Launched | 24 Feb, 1918 |
| Commissioned | 18 Apr, 1918 |
| End service | |
| Loss position | |
| History | Reconstruction to Fast Escort completed on 8 January 1940. Pennant was D 45 changed to L 40 upon completion of this reconstruction.
Sold to be broken up for scrap on 4 March 1947. Commanding Officers: Lt.Cdr. Aymé Arthur Carrington Ouvry, RN Lt.Cdr. Harold Godfrey Bowerman, DSC, RN Lt. John Edwin Dyer, DSC and Bar, RN HMS Westminster is not listed as active unit in the July 1945 Navy List |
