Hi there, I have bought from a few UK stores so far, I have used Hop and Grape mentioned above, I have also used
all 3 where really good, fast delivery and no problems with the orders. I have found it difficult to find one single site that stocks all the different items I have been after so have needed to order from a few different sites.
I think the Hop and Grape site probably has the best overall range, I got my starter kit from Art of Brewing though, it was cheap and seem to be working fine for me. Though I am still just making canned kit beers at this point. I intend to advance to boiling extract and steeping grains next month, I am going to try the Bruheat Boiler - this is a plastic bucket with simmer stat and you can get all the attachments to convert it to all grain- hop strainer, sparging arm and immersion chiller. This seems a better option to me as I have limited space and cant brew outside (I live in a flat).
Its the first item on the Art of Brewing site if you click the beer mashing tab.
Hope that helped a little and good luck!