There is a photo on flickr that states it was W/O 19-8-49. This date is also confirmed on GINFO
http://www.flickr.com/photos/dwhitworth/5452472253/
GINFO has it registered as G-AKFR 02-04-47 untill 06-11-47
Then G-AKLC 27-10-47 deregistered w/o 19-08-49
interestingly GINFO has the c/n as NP282 on the pre 1986 PDF register and H666 on the main site, but I cannot find any details of where it crashed.