Family Chartmasters is a company that is USA based, but I am sure they would be happy to post their produces to the UK. They have a vast array of family history charts to chose from, blank ones that you can fill in yourself or you can send them a GEDCOM file which they will then transform into a beautiful chart to display your hard work !
Lots of options to explore on the site so worth looking at. I’ll do a search for UK based chart printers and report back later.
