More than one issue
Theres more than one issue here, sure the US choppers appear cheaper and more reliable, BUT the UK ones have advantages. First, remember the Falklands, had Argentina been able to make exocets would we have won - I think not, they relied on foreign weapons and ended up losing, we should NOT make that mistake (as we are currently doing on army lorries, shells and bullets!). Second, although the money is more some at least finds its way back through taxes, reduced unemployment, and the ability to export (perhaps not quite the difference).
It does strike me as incredible that we fail yet again to provide ourselves with stuff that works, are we really incapable? I think not, perhaps its the penny pinching paperwork obsessed management thats at fault, I don't know, but we do need to sort it out. We SHOULD use British built helicopters, but we MUST make them at least as good as the best in the world.