How long it's on for
They ask you upon purchase of gift card which free ticket you would like and you have to choose between LEGOLAND Discovery Centre or the Sea Life Centre.
Not all places in the Trafford Centre accept these gift cards there are a few exceptions.. I have tweeted Trafford Centre and they said to call up to find out where doesn't accept these but due to the time it is now, they are closed for the day... https://mobile.twitter.com/traffordcentre/status/614755993470259200
Can confirm. Come today. If you were planning on spending money in the TC anyway it's a great deal.
big massive banner above kiosk