Sorry I don’t live there, but it’s lovely to hear that there are hogs back. Bear in mind that hogs can travel up to 2 miles in a night, so it might be someone a bit further afield who has done the marking.
It’s possible to identify hedgehogs by their natural markings, so that there is no need to artificually mark them. I wrote some tips to help with identifying by natural markings, a while ago, which you might be interested in.
Good luck and happy hog watching.