can i trace service history for a van

if its been serviced at a vw dealers you should be able to obtain the service history no problem ring your local vw dealers service department give them the reg number they will tell you if it has been serviced at a vw garage if so request the printout or a duplicate book :)
ask for details of previous owner so you can check with them, they should be happy to supply that info if not get aa/rac to do a check or just walk away