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Canyoning aka Gorge Walking or Gorge Scrambling takes place in the Brecon Beacons National Park, the best known location for this activity in the UK! http://blueocean-adventure.co.uk/gorge-scrambling/
I actually went Gorge Walking weekend before last near a place called Clydach (Cwm Dyar), and it was brilliant :) I went with a group of about fifteen of us and I organised it through a chap called Michael at http://www.lifechangingactivities.com/ There are some great places as @Berry120 has said in the Brecon Beacons such as the Afon Mellte - beautiful ...
From a search around, it seems there's a number of places that do it in the SW of England, Devon seeming to come up a lot: http://www.yumping.co.uk/canyoning/south-west-england The other place where it seems to be popular is in the Brecon Beacons in Wales, and around that general area: http://www.adventurebritain.com/canyoning-in-wales-uk/
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