This has probably been said before but I can highly recommend Anything Narrow Gauge from Holsworthy in Devon. Very helpful people there and a very fast response. Aftera discussion with Simon,I tried to order some bits over the Internet on Friday, which I managed to cockup spectacularly ( my fault) on the Wednesday I had a call from them asking what went wrong, and if I still wanted the parts. After sorting things out, I received the parts on Thursday ( the next day). Looking at there website, the shop seems very well stocked, my only problem now is trying to wrangle a trip to Devon for a visit!