Green Park tube station

The area just next to an entrance to the Green Park tube station was where the Twelfth Doctor and Clara Oswald encountered agents of the British government attempting to burn a pathway through a forest that had mysteriously arisen overnight. In witnessing the failed attempt, the duo came to realise that the new trees were fire resistant. (TV: In the Forest of the Night)

Behind the scenes
Although the episode does not explicitly make the link, the station, in real life, serves and is named after Green Park, a real park in London.