Oh well, gee, thanks guys. I asked a question and got shot down.
I had a search and I came up with this thread which looked like the most relevant. Obvioulsy it wasn't and I'm sorry to waste your time. It was important to me so thank you for replying anyway.
Just on the side, you know the search function doesn't recognise anything less than three letter words so things such as MEP, TR, ME-IR (I know!) don't get picked up. (Actually the whole world of aviation works on TLAs which can be frustrating in a search function)