why not look at contract lease. about £250 + vat p/m for a Nissan Primastar. Initial payment of about £750 (or 3 times monthly payments). AA package, road fund paid, 10k miles p/a, 3 years man warranty, 100% tax deductable.
All it costs you on top is tyres and servicing. 3 years trouble free motoring.
I bought a 53reg trafic 18mths ago for £7000, already had new clutch, track rods, about £500 worth of work and a week or so off the road and only had 30k on the clock.