Here is what I have on my files:
The P-47C Thunderbolt 41-6628 of the 495th Fighter Training Group was flying above the Peak District as part of a 4 ship formation on a formation flying exercise, in the number 4 position. On entering cloud the formation became split up with the number 1 and 3 aircraft staying together and number 2 and 4 becoming separated. They were directed onto diverging courses by the flight leader to avoid the possibility of midair collisions. In the crash report it is assumed that the pilot, 2nd Lt
Quentin J Sella became disorientated as his instruments may have been giving false reading. Because of this he lost control and the aircraft entered either a dive or spin, the aircraft fell into the ground at Thorncliffe in a vertical dive hitting very soft ground, deeply burying itself and killing the pilot.
Source:
http://www.peakdistrictaircrashes.co.uk/1939-1945p-47.htm