depending on how long ago the car passed roadworthy you may be able to ring the workshop that inspected the car and ask them, how exactly they passed a car with oil leaks etc...worth a try as many dodgy workshops are being repremanded by the government transport department. If not have a ring around brissy there are plenty of workshops who will do the job of a rebuild. Just make sure you know what exactly is wrong and what needs and doesnt need fixing, so you dont get ripped off! Good luck
Matt-