Police officers from Hampshire Police Marine Support Unit and Thames Valley Police monitor Larch l and Swan r, environmental activists from HS2 Rebellion sitting on a line above the river Colne seeking to protect an ancient alder tree on the far bank from destruction, as tree surgeons working with the National Eviction Team continue to cut the tree during works for the HS2 high-speed rail link on 24th July 2020 in Denham, United Kingdom. Officers from the Metropolitan Police, Thames Valley Police, City of London Police and Hampshire Police attended to ensure the removal of the tree by HS2 despite protests from activists.