if you nwant to avoid paying tax when you buy the car fill in the trade slip for them to send off but put whatever name and address you like on it, they still send it off and it comes out of there name so there fine
no trace you have owned it on paper
when you sell again you can do as you wish, i loose many cars through the system every year
you dont need to add cars to your traders policy unless you keep them more than two weeks so every car you have youve only just bought if ya get my drift
auctions are limited now i have trade accounts with them but as you lot say above they will tell the tax man if you buy sell loads, if you buy from an auction private you only get the green slip and have to wait for the v5 tgo come back in your name so thats no good
to be honest the best way is to declare and pay tax but only declare one of every 3 cars, atleast then the tax man gets his chunk and he wont be watching you