The Ceremony of the Constable’s Dues at the Tower of London is a rare and ancient tradition dating back at least 700 years, showcasing the Crown’s authority over the City of London. This year’s ceremony will be extra special, with a helicopter and three Royal Marine raiding crafts in attendance. Originally a tax on mariners, the ceremony now involves a ceremonial march, the delivery of a barrel of fine drink, and a formal handover. Spectators can watch the action from outside the Tower for free, or book tickets in advance to witness the formal ceremony inside. It’s a unique and exciting event not to be missed.
https://www.ianvisits.co.uk/articles/a-helicopter-and-boats-to-perform-a-rare-ceremony-at-the-tower-of-london-70761/