Kids Go Half Price. Ts & Cs: *valid for one half price junior ticket (ages 3-12) with one full paying standard adult ticket (aged 13+). Not to be used in conjunction with any other offer or promotion including family passes. Not valid on Bank Holiday weekends. Juniors are classed as ages 12 and under, adults aged 13+. Infants under 90cm tall are free as part of the normal admission policy and do not require tickets. You must display the voucher via print out or smartphone and have your KidsPass Membership card available to show on entry. This voucher has no cash value. Displays, talks and feeding demonstrations are subject to change. Entry terms and conditions apply – see website for details.