We are in London for only a day stopover. For ongoing travel i need cash pounds sterling. I am buying with cdn dollars. Daily limits on atms are too low. I can't easily get gbp where i live. We are starting our walking tour at the hyde park area then on to Buckingham palace area then down the mall.We'll be walking all day. I need a good currency exchange location preferably early in our day on a saturday.
My plan is to get enough gbp at heathrow to buy tube tickets. Then exchange at a better rate somewhere in town, returning to Heathrow late in the day.
In short what is open on an august Saturday where i can get decent rates at the location mentioned?