I think it's difficult for them to arrest you unless they actually catch you in possession. If you've not had that knock on the door after about a week after the incident, you probably got away with it. If you're unlucky enough to get the rozzas calling you, make sure you have a solicitor present, and if you put your hands up, say how sorry you are and you'll never do it again etc. etc. chances are you'll get a caution (this means a police record, but not a criminal record)
However, even if they don't go to the police, chances are they'll share your image with the towns CCTV team, and so they'll be keeping a very close eye on you whenever you go into the town centre. And yes, it might be in your interests to avoid that store for the foreseeable future.