The Lightning had been out over East Anglia from Hatfield on a flight connected with development of a DH missile (IIRC). There was a fire in the rear fuselage, and because of easterly winds he had to extend out to the west to join for Hatfield's easterly runway. During this extended time in the air, the fire caused either elevator or tailplane control failure on short final, leading to the attitude shown in the picture.
SSD