Thanks for trying. Once you finished tracking, all the tracking data is sent to the server for further processing or next time the device has network connection and the app is turned on.

If the track is accurate enough, has no big jumps in it, it will be visible in a couple of minutes on the appropriate city's map or on the My Area map.

We do add cities manually but all tracks should be visible in case they were accurate enough.

Unfortunately, I cannot see any tracks in London which could mean that the track wasn't accurate enough or wasn't uploaded.