Supermarine Attacker
Jack
Coincidentally I also took a photo of one of the first Swifts at the same event. This was a 56 Sqn (Waterbeach) based aircraft.
From my notes.
The Swift was introduced into the RAF in February 1954, becoming the RAF's first British-built and into service swept-wing aircraft, but unfortunately, because of major control problems when flying at high altitude which resulted in several accidents, they were grounded for a while in August 1954 whilst attempts were made to sort out the aircraft's problems.
Yes, I recall seeing that in Tony Buttler's Secret projects book - so you can draw a line of progressive descent form the Hawker biplanes of the 20s and 30s to the Hunter through a process of incremental design changes.