Hi Graham
I am just about to start the same type of project keep up the good work.
If you are in Amersham (just off J17 M25?) I only live 25 mins away (J11 M25) and could come and give you a hand with bits and bobs if that's any good to you?
Let me know, either post on here, mail me at
richard.hanley@edsgfs.co.uk or call 07730 530 765
Speak soon
Cheers
Rich