New challenge!

The London Loop. The London Outer Orbital Path.
Did section 18 of 24 today from Enfield Lock to Chingford.
Did you know that the King George V reservoir supplies over a quarter of London's water? There are actually two reservoirs, the other being the William Girling, named after the chairman of the Metropolitan Water Board. You are glad I told you that, aren't you?
Conveniently the 313 bus brought us right home to the top of our road. Section 19 next, Chingford to Chigwell. This challenge could take quite a few Wednesdays.