Late notice, but hey, flexibility is what Home Education is all about:
"Alton Towers has a fiery red hot offer to celebrate England's patron saint on:
Monday 23rd April.
On St George's Day, bring a dragon, be it plastic, metal, soft, Komodo or other and enter Alton Towers free. One dragon required per free entry. If you're not feeling brave enough to bring a dragon, don't worry: there is a Spring Sale until 31st May with adult tickets just £18 when bought in advance online. "