> "The people who are on the list are not guilty until they've been prosecuted and taken to court, and the system makes that very clear", Simon says - and under the Data Protection Act "if anyone misuses that data there are very significant fines".
Probably someone will follow you around the shop or ask you if they can help you instead of you not being let in into the shop. Those are already pretty common tactics.
Those tactics also don't feel nice though (I experienced them first hand, when I was in a foreign country and was a bit nervous in shops - not because I was shoplifting but because I wasn't sure wether I would be understood by the cashier).