Thank you guys, that is really kind. The A stock has been a labour of love, for many years now. I hope to one day finish my abortive "Rayners Lane" layout which I made in response to the P4 society and DEMU 18.84 square foot challenge back in 2007 and to make a full train of them to run on it.
With LU being so poorly supported by kits and RTR, scratch building of some kind tends to crop up in LU modelling (part of the reason I never finished Rayners Lane) an invaluable source for producing drawings is:
https://www.whatdotheyknow.com/request/66598/response/170252/attach/4/Rolling%20stock%20Data%20Sheet%202nd%20Edition%201.pdf
I have built a three sided backscene with mirrors in the sides so the train extends off scene a bit, unfortunately it isn't very straight so the effect isn't great at the moment at some point I will sort it.
The next bit is the interior, amazingly, you can even find the seat pattern online: