Final right to reject

[plane_boy]

I purchased a used car from a franchised dealer under their "approved" scheme. Few cosmetic issues with the car were agreed to be put right before collection, but were not - dealer advised they would call me back to organise having them rectified.
Person I was dealing with left the dealership and I ended up having to escalate the points to a manager who agreed to rectify them, but I have also since realised the car has had previous accident damage that wasn't repaired to a great standard - they agreed to also look to see if they could improve on the previous poor paint repair - as this took time I was now just outside of the 30 days right to reject when they collected the car for repair. They have had the car back for 9 days and just returned it to me, but one of the original points they claim to have addressed (damaged trim) has not been fixed and its clearly the same damaged trim still fitted (this was agreed to be replaced as part of the original purchase)

Having now given them 1 opportunity to fix the issues and them not achieving this would this be sufficient reason to reject the car, as I'm not clear if cosmetic reasons are sufficient or it needs to be something that stops me using the car?
Its on finance with the manufacturers finance company but I'm not clear if not fixing a cosmetic issue is sufficient reason to use the final right to reject?

[Pezza54]

If it was a new car or nearly new car, then I would say you would probably have grounds to reject the car. Especially as the dealer told you the cosmetic faults would be rectified. For a used car a few years old, cosmetic faults are unlikely to be accepted as grounds for rejection in court
However you said there are signs of previous accident damage. You need to have the accident repair inspected by another garage to find out if it was a serious accident and if the repair was carried out to an acceptable standard. If the accident was serious and the repair poor you may then have grounds for rejection