From Games Workshop:
Over the phone by ringing the Forge World Customer Services team on 0115 9004995. They will take payment for your ticket, which will then be available for you to pick up at the event on the door. You can do this right up until 5pm on Friday 10th October.
Over the counter at Warhammer World, Nottingham. Tickets will be available until 6pm on Friday 10th October. For directions click here.
On the door at the event. We will have tickets available for you to purchase at the Ricoh Arena on both Saturday 11th and Sunday 12th October.
Warhammer Fest info is here.