just an interesting snippet from life magazine 1967
https://books.google.co.uk/books?id=3EwEAAAAMBAJ&pg=PA101&lpg=PA101&dq=general+franco+fishing&source=bl&ots=aRYTR1zhKM&sig=my9jVQAHKvEVrwluYLE9AGKOkS0&hl=en&sa=X&ved=0ahUKEwjrnb7Xu9XQAhUHAsAKHc9SDc4Q6AEISTAK#v=onepage&q=general%20franco%20fishing&f=false
northern spain (Asturias) is a bit of a stronghold Andy. the permit system is nothing short of; well, baffling, to say the least! it looks like there's a ballot system in operation, which favours locals rather heavily. I've spent may days gazing down into the most stunning gorges up there and thinking, " I wonder...." the sella & the cares are just spectacular. guided would be the way forwards and probably some experience of multi-pitch abseils. I could help you with that bit!
try doing a google search for huchen in spain :wink:
http://pescatravel.com/pesca/rio/espana_eng.htm (http://pescatravel.com/pesca/rio/espana_eng.htm)