Want to help create a leafier London? Get involved in the Tree-Athlon, a 5km run in Battersea Park on September 17 (from 9.30am) in aid of Trees for Cities, an organisation which aims to grow more trees in urban environments and places where greenery is lacking. Runners are asked to a raise a minimum of £25 sponsorship and everyone who takes part gets a sapling to take home and plant. Register now.
For info, see Tree-Athlon Fun Run listing.