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We're in Llandeilo just north of Carmarthen, W Wales.
Probably too far away from you.
If you are on Facebook have a look at the Welsh Black page and get in touch with Sally who is the breed promotions officer. She'll be able to put you in touch with some more local options.
https://www.facebook.com/#!/pages/The-Welsh-Black-Cattle-Society/365305913550243?fref=ts
Photo of Welsh Black cow with her Charolais X calf at 14 months
 

[Barcud]

If you fancy something a bit more interesting how about a coloured Welsh 
http://ancientcattleofwales.org/
these are the old colour varieties before the WB Society would only allow black animals to be registered. They are a Welsh Black in conformation, temperament, qualities etc but with the added bonus of the different colours. Even the old established Welsh Black herds still throw the odd coloured animal.
The RBST hold straws for a belted bull "Rhidian", but we (Ancient Catlle of Wales)  are looking into getting semen from the purest line of bulls in the ACW membership. Or you could AI to a Welsh Black bull through Genus and the chances are you'd get a belted/colured calf, or cross-breed.
The Powell's near Worcester have some nice Belted stock, or Mike Lewis-Reddy near Llandrindod has some nice Welsh Whites.
Regards
Mike