On Jun 25, 2:20*pm, "Dr. Sunil" wrote:

As of Monday, I have now done all the 36 stations within the M25 but
outside zone 6 too. Oh well, guess there's the new South Quay, as well
as Imperial Wharf and the new ELL and DLR stations to look forward to
within the next year!

You could walk all the disused lines as well (or at least as much as
is possible)...