If you buy anything in store at WHSmith, you get a 2for1 voucher for a number of theme parks - one free entry with each full price adult ticket. Use it to get one free entry when you buy a full price adult ticket. It’s valid at Alton Towers, Legoland, Thorpe Park, Madame Tussauds, Chessington World of Adventures, The London Dungeons and a few more...(check the voucher)

Each voucher can be used four times, as it splits up into four mini-vouchers. The offer's valid until Saturday 31 October but there are some exclusion dates, so check what the coupon says before you go and you can only get the voucher from WH Smith til the 29th March.