We do include the public transport options on the BVWS website now (following a similar discussion on here previously). See
https://www.bvws.org.uk/events/locations.php
As noted, RWB is a 15 minute taxi ride from Swindon railway station which isn't too bad. Maybe a forum member travelling from that direction could give you a lift?
Harpenden is close to the railway station so is probably the best option for public transport travel.
The problem is that any town/city centre location with good road links, adequate parking, good public transport links and availability all day Sunday would be prohibitively expensive. It would probably be things like hotel function rooms which are not really suitable for our grubby old equipment either.
The committee are always open to suggestions for suitable venues however, especially as a replacement for Harpenden. However we cannot magically produce something that does not exist!