Thanks for all the info guys, most helpful.
Re Westland, i though that they made them but unless i've got it wrong somewhere it turns out that Westland build the airframes, Rolls Royce make the engines and Lockheed Martin (UK) put it all together. We are awaiting a return phone call from them anyhow.
The BHAB guide is very useful but i'm not so sure how relevant it is to a military helicoptor which operates under different limitations to a civillian machine. More or less onerous? I'm not sure. Think its mostly related to single engine performance (in the event of an engine failure on a mulit engine helicoptor).
Any help as to what MAOTS is?