Campaigners working to protect Richmond Park say a documentary about the impact that visitors can have on the area has started to help limit damage.
The film, released earlier this year, starred Sir David Attenborough and called on Londoners to 'Tread Lightly' in the park.
It's now been viewed by hundreds of thousands of people online alone.
Richard Grey was the films Excutive Producer, and is one of the many 'Friends of Richmond Park'. He says the campaign is working, however more people need to take the message on board.
And, 'Richmond Park: National Nature Reserve' is on London Live on Christmas Day at 12.30.