The London LOOP is a 150-mile circuit of the capital, split into 24 sections. The route is devised and overseen by Transport for London (TfL) who publish free, downloadable notes and maps on their website:
All sections begin and end at public transport connections, making it pretty easily accessible and customisable to your preferred distance by combining two or more sections.
In essence, it is the “M25 of walking routes”, and whilst definitely an urban walk, it works hard to keep to the greener parts of the London fringes, linking Royal Parks, play areas, common land and farmland, and succeeds in this surprisingly well.
We completed this in eleven day’s walking over the winter months of 2105/6, a quite Camino-like walking experience undertaken between the end of our Camino de Santiago in 2015 and the start of the Le Puy route in 2016.