As Mitchaa said; "I'm a betting man " and I think this accident has nothing to do with MGB failure.
Watch out the G-REDL - MRH, mast with swashplate, flared housing with one suspension bar still attached to it - picture in post 145.
Do you see a difference between the end of the suspension bar on that picture and the one on picture in post 172 ?
While this suspension bar is supposed to be bolted to a fitting bolted on the fuselage, the one in post 172 looks un-damaged. I would really like to see the other face of this suspension bar.