A Royal Air Force Signal Office Diary for RAF Woodhall Spa, for 19th May 1944 - 11th January 1945
covering the period that it was used as the base for the famous 'Dambusters' No. 617 Squadron and No. 627 Squadron, which was on loan to 5 Group.

Approximately 161 hand-written pages, with daily entries including individual watch timestamps. Filled out by multiple hands in the capacity of Duty Signal Officer, including F/Lt Sutcliffe, P/O Wilson and W/O Graham and initialled or signed to the right-hand column by each entry. Includes codewords for various missions alongside standby and stand-down orders, flight planning meetings and inspections.

Sample entries include '19th May 1944 - 1100: 627 Sqdn Operating. 1500: 8 A/C. 4 on each target. 1630: Identify on return to Biggin Hill - Channel 'D'. Passed to 5 Gp Flying Control. 1750: Confirmed with base control on B, alt.c. R/T codeword for stop bombing - "Coconuts"... 0200: Complaint by F/Lt ** that 627 Duty Watch did not answer phone & he could not test VHF. Found that duty watch (Cpl Little) had been locked out by offgoing mech. R/T was OK anyway.
27th May 1944: 0215: 'C.O Reported unidentified phone caller put through to him at Petwood at approx 23.30. Wants matter investigated and reported to security.' .. 0440: Interrogation finished. One a/c missing. All a/c reported good wireless conditions.'
4th June 1944 - 2230: W/Cdr (Leonard) Cheshire requires special group for 617 Sqdn only to return to base - APE. given. Passed to 5 Group.'
25th July 1944 - 1145: 627 Squadron Operating. .... 2330: All A/C Airborne. 0400: A/C E, C, O & P early returns. V.H.F V/S on "C" Reposted to Group & signal despatched. 0500: A/C "B" landed. V.H.F O/K. H - Ditched off Cherbourg. 2 A/C down at Ford. N - Chasing. 0600: Reposted to base.

Notes:
617 'Dambusters' Squadron arrived at RAF Woodhall with 34 Avro Lancasters and two de Havilland Mosquitoes, the latter being used for low-level target marking. The squadron remained at Woodhall until the end of hostilities and pioneered using the Tallboy and Grand Slam bombs from the airfield.