I came across a few more photos today which were captioned on the back, one of which identified the flying instructor who tried to get my late gran to scream by stunt flying as John Goodyear. Looking up his name on the net confirmed what I suspected that he was ex RAF, learning to fly at the end of WW1, before eventually becoming flying instructor to the Eastern Counties Aero Club, of which my gran and her brother were members. John can be seen, in the pic below, with his wife, Dorothy, standing next to a De Havilland Moth.
The group photo are some of the members of the Eastern Counties Aero Club in front of a Robinson Redwing aircraft and the photo is taken at the club's home at Blue Barns airfield, near Colchester. The aircraft in flight is a Robinson Redwing.
1933 Who's Who in British Aviation: Name G - Graces Guide