Well if your in Northern Ireland you will probably know of the demand for replicas over your way...
You know roughly whether a car is poor / average / good / excellent so I would say £500 for a poor one as the bumpers etc are worth a little bit anyway, for a average one about £850, a good example £1000-£1250 and a absolutely mint one with full MOT and no small problems nice wheels etc I would say £1500.