The Pegasus Archive War Diary Collection
No war diary appears to exist for the 11th Special Air Service Battalion prior to July 1941, however the National Archives holds several documents relating to Operation Colossus which serve much the same purpose, and these are reproduced below.
Operation Instruction - The Operation Instruction for Operation Colossus, and miscellaneous papers.
Operation Colossus - Description of the raid based on information from Lieutenant Deane-Drummond.
Central Landing Establishment - Central Landing Establishment report, also other reports and comments on the operation.
Miscellaneous Documents - Preliminary proposals for Operation Colossus, discussions on the methods of deployment, and reports of the parachutists being taken prisoner.