River Thames to the strong current of the river, but also other river users. Organised swimming events take place at various points generally upstream of Hampton Court, including Windsor, Marlow and Henley. In 2011 comedian David Walliams swam the from Lechlade to Westminster Bridge and raised over £1 million for charity. In non-tidal stretches swimming was, and still is, a leisure and fitness activity among experienced swimmers where safe, deeper outer channels are used in times of low stream. A Thames meander is a long-distance journey over all or part of the Thames by running, swimming or using any of the above
River Thames river a number of smaller private companies also offer river trips at Oxford, Wallingford, Reading and Hampton Court. Many companies also provide boat hire on the river. The leisure navigation and sporting activities on the river have given rise to a number of businesses including boatbuilding, marinas, ships chandlers and salvage services. The Air Line aerial cable system over the Thames from the Greenwich Peninsula to the Royal Docks has been in operation since the 2012 Summer Olympics. The river is policed by five police forces. The Thames Division is the River Police arm of London's Metropolitan Police, while Surrey