I have a Cadbury 'Who will you take?' voucher do I need to pre-book? Pre-booking is essential and we recommend booking in advance. You can pre-book your ticket through this link. Related articles Do I need to pre-book online in advance with my promotional voucher? Can we bring our own food/picnic in to Alton Towers Resort? Do you offer a refillable drinks vessel? Do children under 90cm go free? Can I change the date of my theme park booking?