According to the Gatwick Aviation Soc publication deHavilland Biplane Transports, the Rapide was G-AIZI and had been owned by Mr Carne at Elstree since 31 Mar 1952 when acquired from Reid & Sigrest Ltd. They took it from the RAF in Dec 1946 where it had served in Berlin as serial NR785. It had been built at Loughborough by Brush Coachworks in 1945.
The same source attributes the crash to power loss on the starboard engine.