Thanks for that, I completely forgot to connect the track bus - even though I have had Richards note on this right in fornt of me! I feel such a plank! I'll get that sorted tonight and let you know how it goes.
As an aside, when I first tested the points I ran an 0-4-0 over them and all seemed fine - however, what I hadn't thought about was that the 0-4-0 had a "Stay Alive" fitted !!! So, obviously the fault didn't show up straight away!
Cheers
Clive (feeling rather silly!)