Correspondence with members of the Ionides family, including Michael Ionides, Cyril Ionides, Lieutenant-Colonel Philip Ionides and Alexander Ionides on subjects including: Michael Ionides joining the Iraq Development Board; implications of the treaty establishing a European Defence Community; irrigating the Jordan Valley; Philip Ionides's patent claim for his invention for rapid airfield construction, 1940.

Other correspondents include: Archibald Sinclair [Secretary of State for Air, later 1st Lord Thurso]; E Harberd, Ministry of Supply Patents department (3); John Gandee [Assistant Private Secretary to the Secretary of State for India].

Also includes: documents relating to Philip Ionides's patent claim.