8:25 am - 6:25 pm
The Thames Barrier is closed for a full test once per year for a full day -- and a convenient day to visit.
It's a chance to see the barrier in its fully closed position, and usually coincides with a high tide.
Contact and Booking Details
More information at this website.
No need to book tickets - just turn up on the day.
https://www.ianvisits.co.uk/calendar/2016/10/02/annual-closure-of-the-thames-barrier-111787 Meeting point, to be confirmed, London, DD/MM/YYYY