Useful to who? I'm sure the AAIB have a coach-load of engineers, scientists and pilots with detailed knowedge etc. available, including people from BA, Boeing and Rolls Royce.
I don't think so:
http://www.aaib.dft.gov.uk/about_us/...cfm?view=print&
I am not doubting that they are very capable, but there are contributors on here with very type specific knowledge.