Port of London Authority
The Port of London Authority (PLA) is a public trust established in 1908 by the Port of London Act to govern the Port of London and the tidal river from just downstream of Teddington Lock to where the river joins the North Sea (near Clacton-on-Sea).
- http://www.pla.co.uk/ - Offical web site
- http://www.pla.co.uk/display_fixedpage.cfm/id/11/site/recreation - PLA tide data
- http://en.wikipedia.org/wiki/Port_of_London_Authority - Wikipedia article