| Navy | The Royal Navy |
| Type | ASW Whaler |
| Class | Lake |
| Pennant | FY 206 |
| Built by | Smith's Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | 20 May 1939 |
| Launched | 5 Jul 1939 |
| Commissioned | 27 Oct 1939 |
| End service | |
| History | Sold on 24 May 1946. |
| Former name | Kos XXVI |
Commands listed for HMS Thirlmere (FY 206)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | Skr. John Main, RNR | 16 Oct 1939 | 16 Dec 1939 |
| 2 | Cdr. (retired) Frederic Thornton Peters, DSO, DSC, RN | 16 Dec 1939 | 24 May 1940 |
| 3 | S.Lt. John Cromwell Varley, RN | 24 May 1940 | 16 Oct 1940 |
| 4 | T/S.Lt. Arthur Marchant Brown, RNVR | 16 Oct 1940 | 18 Dec 1940 |
| 5 | T/S.Lt. Reginald Charles Robert Mortimore, RNVR | 18 Dec 1940 | May 1941 |
| 6 | T/Lt. Philip Geoffrey Colet King, RNVR | May 1941 | early 1942 |
| 7 | A/Skr.Lt. John Main, RNR | early 1942 | 27 Mar 1942 |
| 8 | T/Lt. Philip Geoffrey Colet King, RNVR | 27 Mar 1942 | mid 1943 |
| 9 | T/Lt. Srewart Robert Andrew, RNVR | mid 1943 | 26 Jul 1943 |
| 10 | T/Lt. Leo Joseph Anthony Gradwell, DSC, RNVR | 26 Jul 1943 | 24 Mar 1944 |
| 11 | T/Lt. Brian Vincent Dowling, RNVR | 24 Mar 1944 | May 1944 |
| 12 | T/Lt. Kjell Tholfson, RNR | May 1944 | 11 Feb 1945 |
| 13 | T/Lt. Harold Olaf Olsen, RNR | 11 Feb 1945 | late 1945 |
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Notable events involving Thirlmere include:
11 Jan 1941
HMS Urge (Lt. E.P. Tomkinson, RN) departed Dundee for Scapa Flow. She was escorted by HMS Thirlmere (T/S.Lt. R.C.R. Mortimore, RNVR). (1)
19 Feb 1941
HMS Cachalot (Cdr. J.D. Luce, DSO, RN) made rendez-vous with HMS Thirlmere (T/S.Lt. R.C.R. Mortimore, RNVR) off the Shetland Islands. They then proceeded towards Holy Loch. (2)
20 Feb 1941
Off Cape Wrath HMS Cutty Sark (Cdr.(Retd.) R.H. Mack, RN) took over the escort of HMS Cachalot (Cdr. J.D. Luce, DSO, RN) from HMS Thirlmere (T/S.Lt. R.C.R. Mortimore, RNVR). (2)
26 Feb 1945
HMS Unruly (T/Lt. D.J. Palmer, RNVR) conducted A/S exercises off Tobermory with HMS Sealyham, HMS Thirlmere (T/Lt. H.O. Olsen, RNR), HMS Knaresborough Castle (T/A/Lt.Cdr. J.F. Marchant, RNR) and HMS Seychelles (A/Lt.Cdr. R.E. Baldwin-Wiseman, RD, RNR). (3)
25 Jul 1945
HMS Upshot (Lt. A.J. Boyall, RN) conducted A/S exercises off Plymouth with HMS Gweal (T/Lt. H. Hilton, RNVR), HMS Thirlmere (T/Lt. H.O. Olsen, RNR), HMS Amber (T/Lt. C.A. Lines, RNVR) and another vessel [unable to read the name in the log of HMS Upshot]. (4)
Sources
- ADM 199/400
- ADM 199/1827
- ADM 173/20142
- ADM 173/20193
ADM numbers indicate documents at the British National Archives at Kew, London.