Hi, I've a 53 plate Cupra (diesel) and having had door lock failure identified with both front doors (intermittent issues with locking/unlocking) I've now got an issue with the rear offside door. Problem is, when locking/unlocking the central locking makes an odd noise but more importantly the rear door won't unlock. I guess the lock has failed but seeing as it's locked, I've no idea how to open the door to even attempt a repair/replacement.

If anyone can offer an insight, it would be appreciated.