I would politely refer the OP to my own sentiments about the biggest heap of unadulterated junk ever to gain certification contained in the links.
"execution was a classic example of British over engineering " ......I would politely disagree.....there was nothing over engineered regarding the fit only for Heinz cans or on a range somewhere ..or a coral reef, anywhere in fact other than flying heap
The door shoot bolts, were, I would agree, over engineered as were the control runs aft of the rear hold...now they really took some "imagination " but that was about it. However, credit where it's due. The dripsticks were quite good and so was the anti-skid unit location. That was it . Some of the "hand crafted " holes drilled at Chadderton were not so much over-engineered, but more "over circular ".