Your ticket confirmation: Your ticket is only valid on your nominated date. You will receive an email confirmation at time of booking with your ticket voucher included. A printed copy of this voucher must be presented on arrival at the venue, on the day of your activity. You may be refused entry if you do not present a printed copy of your voucher. Cancellation Policy: Tickets are not refundable. All sales are final and incur 100% cancellation penalties. Bus Times: Buses run every 15 - 30 minutes. Location: Original Tours hop-on, hop-off London Visitor Centre is centrally located near Trafalgar Square and you can pop in for information about directions, West End theatre ticket deals, out of London day trips and pick up a London sites map. They also provide 3 free walking tours and a complimentary Thames River Cruise with our 24-hour, 48-hour and 72-hour tickets so you can get the most out of your visit to London.