If you are like me, opt for public transport over driving/uber, it is with no surprise that by the evening, you would have clocked over ten thousand steps, easily.  

Taking underground/tube in London, you would have to purposefully look for Escalator or Lift, otherwise you would quite likely to be taking stairs.  

Walking on the streets, between stations, between shops, between museums, between cafes and restaurants, all these day-in-day-out activities requires quite a bit of walk.

So, enjoy the bonus benefit - getting the walking exercises done, un-intentionally.