I am still in a full time job and doing some deals from home on cars I have done up. At what point am I obliged to register as a dealer in any official capacity, say the HM revenue authorities? I guess I should be declaring any profit on a tax return anyway, but if I up the ante and start doing more cars, where do I stand? Ultimately if I can convince myself I could do it full-time I would pack in my job and go for it. Any advice or websites I should look at?