The Auster was almost certainly an Auster Autocrat G-AGYO according to well informed sources, seen here at Denham, whilst the DH.Dove which flew in first with Mr Whitney-Straight, B.O.A.C. Board Member and Festival President was most likely G-AKCF. see.
De Havilland DH.104 Dove 1B, G-AKCF, BOAC