I have a licence for the Canal & River Trust waterways,which cover around 2,000 miles of the inland waterway network.However CRT are not the only navigation authority ,and the Environment Agency manage several river navigations totalling 650 miles (such as The Thames,Medway,Nene,Great Ouse) and you have to puchase a seperate navigation certificate from them for these rivers.EA short term visitor permits are good for visits of a few days,but I have paid for a "Gold Licence" which covers both CRT and EA waterways for the whole of 2018 and intend to get my monies worth !
There are a miriad of other navigation authorities in the UK some charging fees (River Wey ,National Trust),(Basingstoke Canal,Surrey & Hampshire County Councils),(River Cam Conservators in Cambridge)(Broads Authority) while other navigation authorities dont charge anything for leisure craft (Tidal Thames below Teddington,PLA) ,(Tidal Trent below Gainsborough ,AB Ports ),(Middle Level Commissioners),(Witham Navigable Drains ).
There are plans for CRT to absorb the EA navigations ,this should happen in this parliament but the question of what existing licences will cover once the waterways have been combined has yet to be consulted upon.
This is a rather dry subject,hope I've cast some light on it.