Sorry to hear about your 'bad day' Gareth.
Unfortunately we're all in the front line with retail shops that have open doors.
Yesterday..working on my own, just happened to look up and noticed this 6' well tanned bloke had walked through the back door and was just about level with the PC, briefcase, mobile phone, etc. When he saw i had spotted him it was.."Oh, I'm looking for Colin, he's a student and he lives upstairs"
Yeah, right...heard that one before. It was probably only because i still had the scissors ijn my hand as i walked towards him that he went into defensive mode with all the crap stories. This morning i discovered that he had also been through the rear doors of other shops.

You just can't be too careful these days!