I think it's only fair to point out parallels in aviation.
Chinook ZA721, 7 killed, 1987. Hole not drilled in actuator during manufacture to receive split pin that would prevent it unwinding, leading to loss of control.
Chinook ZD576, 29 killed, 1994. Two holes drilled in related actuator, for one split pin, weakening structure.
Evidence presented by RAF 1 Star (with integrity) that no action was taken, in order to protect Boeing. Later confirmed by MoD, although saying 'to preserve UK/US relations'. I wonder if the same will happen to preserve Babcock relations?
langleybaston - "Quality of checking and inspection and supervision". Spot on (and in the correct order!). Seemingly, MoD no longer requires any of them. Certainly, the concept of gaining qualifications in the first two (against both MoD and civil regs), followed by experience of the third, is an alien concept in today's definition of a Suitably Qualified and Experienced Person.