Did you put it in writing? Do you have a copy?

If not, your word against theirs.

My clutch was slipping last year when the car was still under warranty, I put it into a vauxhall garage and they could find no fault. I put it in again this year 6 months after warranty expired and I now need a new clutch and DMF. Vauxhall will only pay for part of this as they say it is out of warranty even though I identified the problem before the warranty expired. I'm going to be nearly £600 poorer need some advice on whether I have a case for full payment by vauxhall.

Clutch wear is wholly dependant on the driving style of the main user and the use to which the car is put i.e. short journeys in town or motorway use, these factors variy the life of a clutch enormously. A bad driver can destroy a clutch in a relatively low mileage, I would be suprised if Vauxhall did not take this into account even when the car was under warranty, you don't say what mileage the car has covered but a part payment doesn't seem unreasonable to me.