Anyone any ideas central locking has stopped on the key no problem inside 

Have you tried changing the key fob battery? 

No didn’t think it was that as the spare key doing the same the same keys no problem to start the car but just no lock/ unlock 

The price of a new fob battery will not break the bank, and would eliminate the obvious and most likely fault.

New battery won’t harm for about a quid.

I would also try pairing the remote with the car again.

Will try battery just strange how it stopped on both remotes but they will start the car 

 

how do I pair it again 

Put the key fob on the sync point under the central arm rest and start the car. Keep the other key away from the car so it doesn’t interfere.