Thanks Michael,
My source is the excellent book "Cold War Shield " by Roger Lindsay.
During a moderately fast run at Coningsby At Home display in a shallow dive the aircraft began to roll to the right but as it passed through 90 degrees it broke up scattering wreckage over a considerable distance including the spectator area.
My father was a Sergeant pilot on No74 Squadron at Horsham from Feb 1951 to Jan 1953. By the time of the accident he was flying Tempest TT.V's at Pembrey.
There was an earlier thread with some more detail
http://www.pprune.org/military-aircr...ts-1953-a.html