If by tiered metering you mean Rates 1, 2, and 3, which are, Rate 1, from 05.00 - 20.00, Mon - Fri, Rate 2, 20.00 - 22.00, Mon - Fri, and Sat and Sun 05.00 - 22.00, and Rate 3, every night 22.00 - 05.00, and Public Holidays, then no, I can hardly deny that, it’s on the fare chart on the r/o/s door of every Black Cab, but if you think of that as “surge pricing”, then you’re living in Fairyland, these are the rates agreed in discussion with TFL for working unsocial hours, they’re not charged at certain times when the streets get busy, those are the rates that are charged, unchanged, every day.