Bath is only 9 miles from where I live.
There is a coin shop on Pultney Bridge. Post code BA2 4AY
Mike is the owner and although it is only small, it has coins, medals and stamps.
Telephone number 01225 431918
I do not think it opens on a Sunday
You might also want to visit Philip Cohen Numisatics shop in London, 20 Cecil Court (near Leicester Sq. station).
In Bath I found 2 coin shops in the Antique Centre in Bartlett St. Oneof the shops is called Manston Coins.
Enjoy
There is the 'United Kingdom' section in the newly created 'Coin dealers: The People's List' pinned at the top of 'Free Discussion' ... I created it for a reason. :)