This walk was done in reverse of that done in the book. Walk starting at Oxshott and finishing at Hampton court by slightly different route on 10 January 2018. It works better if you want a shorter morning.

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
$gpx1="images/gpxtracks/oxshott-to-hampton-court-10-jan18.gpx";
RLicense::GoogleMapKey("AIzaSyDk2Sg2P7tSkLxoaJGWaIp19_4ik173jCY");
$map=new RLeafletGpxMap(); // standard software to read json feed and decode file
$map->linecolour='#782327'; // optionally set the route's line colour
$map->displayPath($gpx1);
?>

Download the GPX log (save as)