Earlier this year I wrote about Walk London's free winter walks.
Well, they have recently announced that Saturday 30th and Sunday 31st May will be SPRING INTO SUMMER WEEKEND when 41 guided walks across Greater London will be FREE to attend.
Find out more here.
There are also many lovely designated and protected paths in and around London that are always open and well worth investigating. These include The Thames Path, The Capital Ring and The Lea Valley Walk. Find them all on the TfL site here.