Checkers dishonesty

Checkers are ******, plain and simple. They advertise one price on the shelf and charge another at the till. This happens almost every time they advertise a "special" on their shelves - They offer a huge discount on the shelf ticket, and then charge the full price at the till. This is a consistent practice, and has happened to me almost every time I try to buy an item on 'special' - to the point where I now photograph the shelf ticket before going through the till, and catch them out! It is pure and simple *****ery, and I'm sure it violates the Consumer Protection Act as well.