Davaar: The info is from Broken Wings, by Air-Britain, isbn 0 81530 290 4.
My copy covers from 1945-1999, all RAF types, and only those accidents which resulted in loss of the aircraft.
The 144/44 numbers are from a quick count, and may not be accurate, but I think they are pretty close.
It is sobering reading for those of us who flew in that period.