"Dave Arquati" wrote in message

[snip]

There is software available to companies involved in transport
planning
which can plot "isochrones" (contours of time) of public transport
journey time to a specific point in London.

Unfortunately I can't immediately see any available on the
internet.

When I joined my last company in 1988 the personnel dept had a
printed map for London's public transport, mostly oriented to trains
coming in from outer suburbia, as I recall. The map was ancient
then, disintegrating, and held together with sellotape. I don't
remember who published it. As a child, I remember seeing pre WW II
atlases, old then, with maps of Britain, coloured like contour maps,
showing time to reach London by train.

I think the newer versions of Autoroute do isochrones for cars, and,
of
course, bikes.

There's something funny, though, about the numbers Autoroute produces
if you send it out on a bike at 10 mph.

Every now and again I see "accessibility maps" put out by London's
planning or transport people. I think they credit it to a program
they have called PTAL, or some such. I wonder if you could demand a
copy of the program under the Freedom of Information Act.

Jeremy Parker