 That was mainly because of high rainfall, which tends to mean more human effluent ending up in the river. But now, summer weather has finally arrived and the latest water quality readings have been positive. So, fulfilling a promise, the Mayor, Annie Dalgo, is to take the plunge this morning, accompanied by the Chairman of the Olympics Organising Committee, Tony Estanguet, and possibly by some journalists too. Hugh Schofield with that report. That's the latest BBC World News.