hi chopper, we had the same problem. couldnt get finance and when we could they wanted silly amount of deposit!
what we do now is rent a car, we pay £65 a week for a 2001 reg nissan micra-not the best of cars, but very very cheap on petrol! that £65 includes insurance, taz, mots, services, breakdown cover from the AA, everything except petrol! the dont want a deposit, just credit card details
we had a 2001 BMW b4 this car, and was paying £150-£200 a week just for petrol!!!
we had alot of bills at the time, so couldnt afford to keep paying for the BMW so got rid. but we have found this is the best option, this way you dont have to pay for anything, only the excess if you crash, but thats the same as any car! plus you get a curtesy car if something does go wrong with it!
well worth the money i think!