Thanks Mike, I think that's exactly my problem. I hadn't realised that, even though we've had the car for five years. Does that mean that the tailgate can always be opened using the button on it if the intelligent key is nearby, even though the other doors remain locked?
Many thanks for your help.

Thanks for the quick replies. The tailgate remains unlocked whichever of those methods I use to lock the car. I can always open it using the rubber button above the number plate. I think there must be some problem with the central locking connecting to the lock for the car tailgate.

Thanks for the quick replies. The tailgate remains unlocked whichever of those methods I use to lock the car. I can always open it using the rubber button above the number plate. I think there must be some problem with the central locking connecting to the lock for the car tailgate.

Hello, the tailgate on my 2015 Accenta Preimium will no longer lock when I lock the other doors with the central locking. Has anyone had a similar problem?
Thanks for any advice!