Great day out if your kids (or you) are a Lego fan. You can spend all day there. Take a packed lunch though and lots of money for photos and the shop. ;-)
"Weekends and school holidays are the busiest times! If you can visit on a teachertraining day or in term time make use of the 4pm discounted entry offer" - via @topdogdays
I agree with Tony H. Vastly overpriced but the cinema does go someway to appeasing the disgust over the pricing for what is a playcentre with Lego and branding. Try to get BOGOF vouccher from Tesco.
LEGOLAND® Discovery Centre Manchester - it's like you’ve just jumped into the biggest box of LEGO® bricks ever! Over 2 million LEGO bricks under one roof!