Thanks to everyone who came along, I checked the distance and it turned out to be only 9.3 miles. Here are some photos.
Our first stop was here, where those of us who are more easily led astray succumbed to the temptations of the nearby ice-cream van.
Views from Wolstonbury Hill looking east towards Jack and Jill.
Happy wanderers on the way to the pub. Notice how they're all ahead of me.
Railway tunnel entrance at Clayton.
Happy wanderers on their way back from the pub (visible in the distance). Notice how they're now all behind me.
