On 2 Nov, 00:45, (Mark Brader) wrote:
Clive Feather:

When you've finished, the grid holds the distance to the nearest
station. Convert it to a GIF and fiddle with the colour map and, for
example, you can have a map where places within 1km of a station are
green, within 2km are yellow, and more than 2km are red.

With suitable travel-time assumptions, you can make an "isochronic map"
like this one, which I occasionally use as a screen background:

http://www.mysociety.org/2006/travel...al-london-big-...

Delete the last component of the URL to see other examples by the same
people, and discussion. Google on "isochronic map" to see examples by
other people.

According to your link Surbiton Station is nowhere near a station.