From the alton towers website
Where can I book tickets?
From Friday March 1st you can book tickets online at www.altontowers.com/alton-towers-live
I have a Merlin Annual Pass, do I get a discount?
We have a limited number of Merlin Annual Pass discounted tickets – at £40 they give just access to the concert arena, you can use your Merlin Annual Pass to enter the Theme Park. This is a great saving of over 25%. These tickets can be purchased online at www.altontowers.com/alton-towers-live
from Friday 1st March. You need to have a valid Merlin Annual Pass at the time of booking and visiting to receive this discounted price. As a Merlin Annual Pass holder you collect your concert ticket on the day.
I have a Premium Merlin Annual Pass – doesn’t this mean I have no restrictions?
There are no restrictions at Alton Towers Resort Theme Park in the main season and this date is no exception. You can use your Merlin Annual Pass to enter the Theme Park on this date. The concert arena is separate to the Theme Park.