"@Nigel from New Zealand: Not sure exactly what your point is here. If you are a customer in a lot of places in London (e.g. McDog, Wetherspoon, Taylor Walker or Fuller's pubs, etc.) then you don't pay for using the WiFi there. I mentioned St Pancras International Station because you just have to be there to use it.
When you go to those places the WiFi hotspot will just show up. In McDog or Wetherspoon (and Taylor Walker pubs I think) look for The Cloud. In St Pancras Station it is their own branded supply. In Fuller's pubs, ask behind the bar (you need a password for theirs).
Hope this helps.