Have you had a text recently offering a free meal for you and a friend? If so, you can use this more than once! Morally wrong but myself and a friend have been going all week so far, with another confirmed booking this morning. Also due to the different staff on every day, they never notice!
I think it's running all this week, because it's running with the Spring promotion of their new menu's.
If you've had a text, all you'll have to do is text back again to '80010' with the word 'Specials' to get another free confirmed booking.
Tip: I think they wipe you off their list if you fill out the customer satisfaction survey, make an excuse you're late back for work and take it with you to 'bring it in tomorrow'.