RJS,
Really? For all their faults, Westland are in a no win situation if the owner (MoD) cut costs by not buying spares, then have to rob other aircraft to keep operational machines going. What evidence have you that the fault is the aircraft design, rather than no spare parts for normal maintenance?
I had the opportunity to visit Westland at Yeovil a few months back, one of the issues that is being addressed is spares support, and the difference in MoD procurement policies and reality. Remember the problems with Lynx gearboxes, and lack of spares? When the spares supply line was thoroughly investigated, nearly 40 (yes 40!) Lynx MGB's were "found" having been lost in the supply chain of MoD
Yet at the time, Westland were being blamed for not keeping up the overhaul supply.
Rather like saying your Ferrari is a lemon and won't perform, because the dealer hasn't bothered to order spare parts to keep it maintained.