Nick and Sasless,
Your answers as ever fill the void that many of us have, thank you for your really concise and well explained answers, and like many I feel humbled that you are prepared to give us this sort of background detail.
Never the less " Chickenhawk" is exceptional in giving much detail but just enough to make you understand what is happening, like I said in my opening post " its almost like being in the jump seat!"
My regards
Peter R-B
Vfrpiltpb
Sasless, I met you about 2 years ago when you came up to the Ribble valley to look at the "Private Army Hardware"