How to make London greener: stick up a tower block with a roof garden

The idea may not win the Garden Museum’s competition but, as a parody, it deserves a prizeThe Garden Museum in London is running an architectural competition for the design of a pavilion for St Mary’s Gardens, a leafy enclave next to its premises in a converted church in Lambeth, south London. I am a member of the interview panel. The winner has yet to be chosen, but I can reveal that it won’t be a submission from one Minecraft builder that shows a blue-tinged skyscraper that o