Pete,
The Troutbeck valley is farmed pretty much all the way to the back of the valley. Only once you start climbing the valley walls would camping become an option but by then you're out of the tree line.
Despite the most careful of persons, open fires in the Lakes are fairly hard to have (unless prior premission has been sought) as anywhere low down is usually farmed or near houses.
How long did you plan to go for, are you carrying everything or do you need supplies mid-trip, tents / hammocks / on't floor in a bivvy bag? Let me know what sort of campsite (wooded area / high up in the hills / both) and I'll try and make some suggestions around central Lakes area.
Lostagain? No, just taking a break from knowing where I am.