The first Jet Provost, a T.1 c/n PAC/84/001 XD674. Not sure when the pic was taken but it first flew 25.1.54. The early JPs used piston Provosts u/c legs.
This aircraft made a wheels up landing on the grass at Luton 18.7.54 but it flew again the same day! It had a varied history and the airframe is now engineless at Cosford.
Someone on another forum has identified the chap in uniform as the Chief Airport Fire Officer, Vic Cable. In the days when test pilots wore ties!
Credit: BAE Systems Heritage - Hunting Percival Archive.