What we do Catchment partnerships Ernest Cook Trust River Coln Restoration Project Waterbodies covered Thornhill Ditch and tributaries Coln (from Coln Rogers) and Thames (Coln to Leach) Led by the Ernest Cook Trust, this project aims to improve water quality throughout the estate through riparian management and river restoration. By engaging land-owners to fence of river stretches and plant riverside trees, the project will improve water quality alongside habitat diversity for fishes and invertebrates. To read more about the various projects within the Upper Thames Catchment Partnership, click here. Manage Cookie Preferences