Most if not all Jessops stores will stock film. The bigger Boots chemists stores might stock some colour MF and some B&W MF.

However if I were you I'd buy what I think I might need and a little more just in case from a retailer such as AgPhotographic, Silverprint or Mathers of Lancashire.

Even if there are specific shops in both counties, they are big counties and may be in towns that you have to go out of your way to get to