If a road or rail trip out of London is a possibility, Coastal DCC in Ipswich is my 'go to' DCC retailer, what Kevin Dickerson doesn't know about DCC probably isn't worth knowing, and he's very helpful to boot. (Avoid Saturdays when exhibitions restart as he regularly sets up shop and demonstrates at those on the dry side). I'd suggest a call ahead if you want to book a demo slot.I'm in deepest West Cornwall, Nigel. I have been to Kernow Models in Camborne who are excellent although I don't think they have any DCC systems up and running. I am going to London in November but from previous correspondents on this Forum the London model shop scene looks pretty sparse. Penzance is a long way from anywhere but if I had some addresses day trips could be the answer.