Party says it acted after being contacted by the regulator about the candidate for Central Suffolk and North Ipswich

• Sign up to our Election Edition daily newsletter

All along the course of the Thames, turning north, meandering south, passing through locks, historic landmarks, Richmond and Kew, swelling beneath the House of Commons with the turning tide, and on to Docklands and beyond – concern for the health of the Thames has led many other ordinary people, who live, work or play on the water, to take up the fight for the health of the river.

The last 15 years of decline in rivers suggests they have much to do. In 2009, a year before the Conservatives first took power in a coalition with the Liberal Democrats, a quarter of English rivers were judged as being of good ecological standard, a marker which examines the flow, habitat and biological quality; by 2022 not one river was in a healthy state.