What connects motorway M25 and general James Wolfe

Another day off, another motorway walk. But this time I was dragging my girlfriend with me so I had to add something extra to my, normally, ultra-geeky motorway explorations. After spending some time over an OS Explorer map (number 147 to be precise), I finally had a clear plan of action. We started our trip in Dunton Green station conveniently located less than a mile from the interesting junction 5 on M25 (the one where M25 is joined by M26 and A21).