The photo machines in Tesco, Boots, etc don't have scanners built into them. (They can only handle digital data on SD cards, memory sticks, etc).
Your easiest way to get a duplicate photo is to find someone who's got an all-in-one printer (or, of course, a separate flat bed scanner and printer) and a stock of good quality photo paper. That's probably about a half of all households these days!
Otherwise your nearest branch of Snappy Snaps can definitely do the job:
https://www.snappysnaps.co.uk/photo-services/photo-scanning.html
Store-finder here:
https://www.snappysnaps.co.uk/
Otherwise