I used the guidebook "The London Loop" by David Sharp/Colin Saunders (2012) which is much better than the rather useless directions on the Transport for London website. London Mayor, Boris Johnson, has withdrawn funding for the walk I believe.
We had lunch at Georgian Country home, Sidcup Place, which is now run as a restaurant by Brewers Faye. Hot burgers and chips, tasty because of the cold but nothing much to write home about. It was interesting to look inside Sidcup Place and imagine what it looked like in the past (bottom right).
The last part of the walk was the best. Scadbury Park and Petts Wood was beautiful and peaceful. Only 13 more walks and about 134 miles to go.