Now I know these cars are full of electrical conundrums but this is a bit weird.
I was sitting having a nice relaxing cup of tea on the patio, P38 parked up about 20 foot away then I heard a strange double clicking noise, like two clicks one after the other. A short while later this happened again and then repeated every few minutes. On investigating, this noise which sounded like the central locking engaging or disengaging was coming from the car. I believe I can see a slight movement in the door buttons but it isn't locking and unlocking as I would've thought. I locked the car with the fob and that seemed to stop it.
Even stranger later , I started the car up and this occasional clicking continued with the engine running! How very strange. I had to go somewhere later this afternoon and the car behaved itself and this clicking didn't occur while driving.