Sure i read somewhere that the water in the lakes was too acidic to sustain carp, i dont know if this is true or not.
I have dangled on windermere,rydal water,ullswater,wastwater(although got turfed off wastwater because it's used for diving).
There's a camp site called waterside at ullswater that you can pitch up and fish more or less 20 meters from your tent. Good fun for perch and trout. And a nice 15 min trekk into the lovely pooley bridge village
You could try esthwaite which is a commercial trout fishery,good chance of a catch there.
I would look for tributaries that run into your chosen lake and have a go for the wild trout(you may have to pay for a day ticket).