Go for a drive and leave the car a while away - just in case something is interfering (it uses the same frequency as the remote central locking so try using that ie click the fob to open and close the doors to check that’s all ok).
If a different location sorts it you may have a local issue. If the car is relatively new, take it to a dealer - I think UK ones are warrantied for a year but may be wrong.
Alternatively if they won’t sort it see if someone has some autel tpms kit or similar which may help you find out if it is a sensor or the car. 1 messed up sensor can unfortunately upset the whole system - I once had a Chrysler where the dead sensor stopped the central locking working so had to use the key and set the alarm off. Dead sensor was obviously transmitting garbage to the car, replaced and all was well.