76 crash report now available at AAIB website.
Excerpt:
During the metallurgical examination, evidence was found of an anomaly in the scarf joint between the two titanium leading edge erosion strips. The tip of the tang on the inboard end of the outboard erosion strip was bent and folded under the outboard end of the inboard erosion strip (Figure 1). This resulted in a doubling of the thickness of the erosion strip material in that area which in turn resulted in virtual contact between the erosion strip and the blade's titanium spar especially in the areas at either end of the tang's fold line. This anomaly had occurred during the blade's manufacturing process some 21 years prior to the accident.
http://www.aaib.dft.gov.uk/special/gbjvx/gbjvx.htm