Thanks for your input everyone.

I looked at the headland posted earlier when I went that way last year, but there wasn't a flat spot. I eventually camped towards the east end on the north side in a lovely wooded area on the loch edge next to a stream.

https://mobile.twitter.com/OverthehillsB/status/865105105451982848/photo/1

I'll see if I can get a grid ref for you.

NN403692 , you'll pass a really obvious cascading stream to the left of the track, then just drop down to the loch shore to the right. You've gone to far if you pass through the gate at the east end of the loch.

Here's a better view of the spot.

https://photos.app.goo.gl/jCKZLxOvcjU3AhGr1