If your really wanting to keep costs down, why not go for somthing like this....
http://www.hbc.co.uk/cgi-bin/zyview/...ding/R=5836366
Ok, maybe no a car C as it requires a ViC check and they might be a bit funny if you turn up with a tribute swb and not a z3, but certainly look at cat D cars that dont require a VIC check. Youl pick 1 up for pennies!