I wrote to Sam Smiths donkey's years ago asking for a list of their tied houses but got a reply stating that they were just a small Yorkshire brewery. I think they may have suggested some areas in Yorkshire.
The one that interests me the most is the Fleet Street Olde Cheshire Cheese as on a visit to Marston's brewery when they were the only pub in London selling Pedigree I was told they sent more Pedigree there than to all of their Southern outlets which I believe were mainly in the Winchester area.