I'm comfortable with the Gerrards Cross section onwards, but does this look like its a sensible enough route back from The Dean?
https://goo.gl/maps/qA658Ax2a3s
Might be worth looking at the route of London Oxford London. Although that takes you to Ruislip, which doesn't give you many great options to get back into town.
@inappropriate_bike started
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I'm comfortable with the Gerrards Cross section onwards, but does this look like its a sensible enough route back from The Dean?
https://goo.gl/maps/qA658Ax2a3s