• Did this over two days and it's about 100 miles I think.

    I did it geared on an MTB and stopped over in a B&B in Henley.

    Not all of it is cyclable (either inaccessible or prohibited) after you go beyong Windsor, but there is usually a decent road running close. I'd advise getting on of the Geo maps from somewhere like Stamfords or The National Map Centre on Caxton Street

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