According to

http://www.orpheusweb.co.uk/vicsmith...nts/Nov31.html


25 Nov 1931 J8646 AW Siskin Upminster, Essex
25 Nov 1931 RAF AW Siskin Upwaltham, Sussex 1 Sqn


Actually I think these incidents are confused

Siskin J8646 piloted by Flight- Sergeant Colin Scragg 365318 (later Air Vice-Marshal Sir Colin Scragg (36121) ) of 1 Sqn Tangmere
Crashed at Upwaltham on South Downs on this date. The machine cut a swath 70 yards long through the wood and finally turned turtle after felling a large tree. The pilot escaped with scratches only

Serial confirmed by picture of incident in The Sphere - Saturday 05 December 1931