QRB is british as is leather helmet and oxy mask; parachute appears to be seat type rather than backpack; angle of fuselage to the ground suggests tricycle undercarriage so maybe a P39/63 or even a Meteor (not a Vampire as this had a wooden fuselage and the aircraft shown is metal)? Collar of shirt has what appears to be a button on the 'point of the collar but weren't RAF crew issued with separate collars with collar studs rather than button down collars?