Not sure if you have to purchase anything in store as I picked one up from the desk as I walked by thinking it was a free leaflet.
Anyway gives you 2 for 1 tickets to the following:
Madame Tussauds London
Chessington world of adventure
Sea Life Santuaries
Each booklet contains four of these vouchers plus an up to 50% off Alton Towers resort hotels and 25% off Chessington hotel.
Thought it'd be helpful for the summer hols.