I bought a Vectra C from a private seller which had developed a fault with what he thought was the immobiliser. The seller tried to rectify the fault before i paid for the vehicle by taking it to a dealer for diagnostics but they couldn't find out what was wrong. The seller agreed to pay for the car to be fixed if the fault returned. After i bought the car the fault returned the same day i collected the car (no lights, indicators etc whilst driving home) and wouldn't start after my OH washed it in the evening. On the 2nd day it had to be recovered back to a garage as it wouldn't start. After further investigation it was found that the fault related not only to a faulty immobiliser control module but also to missing components vital to the cars safety equipment (mainly airbag and airbag control module). I asked the seller to contact the dealer to ask what they did at which point he admitted that it was done as a favour and not a genuine diagnostic. In the original description of the car he stated the car was in excellent condition with no problems. After i had the car recovered, the seller admitted that the car used to always play up in the wet weather! The seller is now refusing to pay for the repairs and has lied about the car. What are my rights to claim back the cost of the repair which is over £1000?