The River Spey is a river in Scotland that runs 107 miles (172 km) to the Moray Firth at Spey Bay, making it the second longest river in Scotland. The Spey is unusual in that it increases speed as it flows closer to the coast, due to the surrounding geography. The mean flow is around 16 m/s making it the fastest flowing river in Scotland, possibly the UK (depending on what constitutes a river.)

 

I found one I could answer 

Ann