Most UK keys are Yale or simular enough that Yale fit, say 80+%. So this customiser will allow you to copy your keys.

Printed, and the new version fits the Yale profile (finally!). It needed a few corners filed off that were catching, but then it worked fine.

1) Compare the key again the screen, moving the sliders until it matches (align the stopper too).
2) Select "print ready > yes".
3) download and print. [0.2mm layer height and support recommended]
4) maticulously remove support, and go over with a knife / file removing any bits that may catch.
5) please leave me feedback to improve it :)