Accident free ... are we not forgetting about the Dak (some years ago) taxying back into a sign post comically erected by Works Services whilst the graceful old lady was airborne?
Compared to the civvy war birds flying record, that of BBMF is beyond reproach. This is down to a combination of maintenence, professionalism, practice and sheer skill.
BBMF - best unit, best aircraft. Best maintained aircraft I've ever seen. Bar none.