| 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 at Devonpost Dockyard was 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 |
Commands listed for HMS Westminster (L 40)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. Aymé Arthur Carrington Ouvry, RN | 20 Dec 1939 | 10 Aug 1942 |
| 2 | Lt.Cdr. Harold Godfrey Bowerman, DSC, RN | 10 Aug 1942 | 17 Jan 1945 |
| 3 | Lt. John Edwin Dyer, DSC, RN | 17 Jan 1945 | Apr 1945 ? |
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