You can check the files in AIR 81 in the British archives: these files cover cases when RAF personnel was killed/wounded/captured in operations or in air accidents, so the equivalent of both MACR/accident reports for USAAF.
See catalogue here
http://discovery.nationalarchives.go...wse/r/h/C16484
You can also check the AVIA Civil Aviation Accident Report (
http://discovery.nationalarchives.go...owse/r/h/C1428). Despite the Civilian in the title you can find RAF accident crashes in it.