Hampshire Police Marine Support Unit officers and National Eviction Team enforcement agents monitor Swan, a female environmental activist from HS2 Rebellion sitting on a line above the river Colne secured to an ancient alder tree which she was seeking to protect from destruction, during works for the HS2 high-speed rail link on 24th July 2020 in Denham, United Kingdom. A large security operation involving officers from the Metropolitan Police, Thames Valley Police, City of London Police and Hampshire Police as well as the National Eviction Team ensured the removal of the tree by HS2 despite protests by activists.