Detailed directions about the route can be obtained from the altimetry (last figure of the gallery), from the captions of the individual photos and from the "Google Map" at the bottom right, which can be enlarged as desired. Double clicking on the photos you can view them at the highest resolution.
Description of the route
The final segment of the trip: starting off with more unpaved sections and steep grades; then coming to the top of a hill one finds a sign announcing the arrival into Greater London; at the bottom of the descent red, double-decker buses confirm we have arrived in London.
Arrows along the bike route pointing to the residential streets would lead to more steep ups and downs; but I had noticed that along the primary street there are two narrow bike lanes which I prefer to use, no more ups and downs, as far as Battersea, then to Chelsea Bridge, crossing the Thames, and finally, we are right in the center of London.