What is it like at the Thames source at Kemble in Gloucestershire?
It is very rare to find water there but there is now.
You usually have to walk downstream for about about a quarter of a mile to cross the Fosse Way before finding water.
George Monbiot has made a film for The Guardian showing his visit to the source last week.
In the short film he also goes to Hurley near Marlow where he takes to a canoe and finds The Olde Bell closed.