Hi
I am based in Trowbridge but haven't played regularly for quite some time.
I know that Bristol is well served by Bristol Independent Gaming - B.I.G.
https://www.bristolindependentgaming.co.uk/ but they aren't easily accessible from the train station.
The Bath
GW would be accessible, and might be a good point of contact to other groups? Bath has a large student population.
Westbury has Triple Helix Wargaming,
https://www.triplehelixwargames.co.uk/ which is mostly online, does have a bricks and mortar outlet and has hosted events and clubs. But I don't know if anything has happened there since the pandemic.
Cardiff has Firestorm Games,
https://www.thebattlefields.co.uk/events-at-the-battlefields which has lots of events.
Further afield, Devizes has a regular club but no train station. Then there are others further into Wiltshire.
Hope that helps.
Sam