They don't permit you to ride it in this time, except slipping the cleaners (who aren't the normal ride operators) £20 will get you on one of the pods.
It's a hell of a rush although tbh only a matter of time until somebody gets hurt then they stop this.
Wait, I've just read your additional comments. So disappointed.
I'm arriving approximately then, and I'll be in London for four days (Saturday evening, Sunday, Monday, Tuesday morning).
What is my best choice in terms of price / convenience for paying for the tube?
If you hail a black taxi at Trafalgar Square and demand to be taken to Fleet Street, the driver is obliged to let you get off without charging you if you cry bedrifan at the start of the journey. This is a due to a little-known rule dating back to the 17th century that sought to tackle to predicament of sheep being driven down the Strand and interfering with traffic. It is rather nebulous but all the taxi drivers know about it and will oblige.