Correspondence between Sir Archibald Sinclair [later 1st Lord Thurso, Private Secretary to WSC] and Captain T B Marson (3) on expenses incurred by Sir Hugh Trenchard [Chief of Air Staff]; [Lord] Edward Hay [Military Secretary to High Commissioner in Palestine] on payment for the Palestine delegation; and W H Eggett (3).Includes copy of letter from WSC to Sir Warren Fisher [Permanent Secretary, Treasury] on the payments of expenses and summaries of expenses incurred by various officials attending the Cairo conference.