TERMS & CONDITIONS 50% off tickets to The Gunpowder Plot. This offer is valid at the following venues: 8-12 Tower Hill Vaults. This offer runs from Thursday 23 November until 23:59 Wednesday 29 November. Please select the special offer tickets on the event page when selecting your ticket from the ticket type listing. Please note, a processing, delivery, venue and / or venue restoration fee may apply per transaction. This online offer is subject to availability, cannot be used in conjunction with any other discount and does not apply to tickets already booked.