Some time ago there was a pollution incident on the Trym and as a result BART have benefitted from a settlement – see story by copying this link https://www.gov.uk/government/news/first-enforcement-undertaking-accepted-from-water-company
As a result we have started walkovers and collected data to identify what we can do to help improve and sustain the stream for the benefit of local people. If you live locally and are interested in helping please get in touch.