Based on the fix me type, It's a station help point. An interface with speak, microphone and two buttons. One button is for emergency assistance, the other for information. You can get through to a human for help. It's not a general phone. Most stations in the UK have them.

Looking at https://wiki.openstreetmap.org/wik/Railway_stations amenity=telephone is the closest however it's not a general telephone and doesn't look like a telephone but can be used like one but to only the train company and emergency services.