help buying a car

#1
Hi all,
I am getting my DNI in the next month or so, I want to buy a car....(renting is astronomical), does anyone have any advice or tips, for foreigners buying a car... including getting proper insurance on a UK licence....
and does anyone know anyone who we can trust to negotiate for me in the process and make sure I buy it legally and without finance on it, wrecked etc....
thanks

nick