We recently made a successful Freedom of Information request to the Environment Agency to find out about pollution incidents in the lake. There have been 17 notified incidents since 2001, six of which killed fish. The worst was 14 years ago, when an unauthorised discharge of alkalis (probably cement washings) killed 7,000 roach and bream. The most recent was in November last year, when an unidentified pollutant killed 500 roach. We are concerned that many more incidents go unrecorded and, together with Wimbledon Park Angling Club, are currently trying to arrange a meeting with Thames Water to discuss preventative measures. We believe that more sensitive planting on the golf course would help, since marginal water plants can help filter out harmful substances.