Can you identify where in London this picture was taken and what it’s of? If you think you can, leave a comment below. We’ll reveal the answer early next week. Good luck!

The leaf shape was probably a bit of a giveaway but well done to Val – this is indeed located in Kew Gardens. It’s on the wall of the Rhizotron, located under the Xstrata Treetop Walkway, which takes people underground to see the relationships between tree roots, oil and organisms such as nematodes, beetles, woodlice and bacteria. For more on Kew, see www.kew.org.