I’ve been to Knapdale a few times. The wetlands created by the main dam are pretty spectacular - Unlike any other landscape in Britain. It feels like the setting for some Southern Gothic horror story. The lodge in the northern loch is pretty easy to spot too. Still not seen any fecking beavers, though…
There’s also some wild beavers on a private estate just north east of Perth, although you have to do a fair bit of exploring to find them.