This is probably useless to many people but amazing for those it works for.
Basically, if you're a teacher, you can get free entry to any Sea Life Centre in the UK for a year!
Just ring them and ask them for a teacher form. Then return the form with a photo and a letter from your school with letterhead confirming you work there and they send you a pass.
I've got one, went about a month ago.
Oh, and it's not just for one person - it admits up to four - two adults and two children - I went just with my wife.
The same family ticket costs £53 each time you go. Even if you go once, you save £53.