It's mostly a waste land over there, as you say.
Weston and Taunton are the best areas in the county, Exeter at a push if you can head further south over the border into Devon. The latter two are likely to have loads of transients and B&S, so you're going to have the luck of the draw. Weston is a bit more stable but tends to be older MILFy sorts. Maki/Cici was good in Weston, reviewed by me here,
https://www.ukpunting.com/index.php?topic=285464.0 , but she told me she moves around between WsM and London, so luck of the draw there for you, and I'd not expect to see the same SP twice there.
I'd probably head further north to Bristol if it's 20-30 year olds you're after, with a good track record on here and guaranteed as much as you can be to see who's been reviewed.
I've not visited her personally so this isn't a plug, but I recall Nieve(26)
External Link/Members Only has had at least one good recent review on here, but only offers massage as far as I recall.
Likewise you might want to consider Sarah GFE who's had a string of good reviews (again, no personal experience, so I'm
not personally recommending her) - put her name in the search box - but you should be able to find what you want in the South West section here:
https://www.ukpunting.com/index.php?board=21.0