Well, nobody replied but my post has had 46 views to date, so I guess there's some interest, perhaps from people who haven't been there.

Saturday was brilliantly sunny but with a stiff breeze. I walked Culter Fell via Fell Shin, returning by the track by Coulter Reservoir.

Route here: https://www.walkhighlands.co.uk/Forum/viewtopic.php?f=9&t=88422  

About 10 cars parked - more than I'd hoped. Got naked to ascend Fell Shin. Dressed near the top as two couples came the other way and it was getting chilly anyway. They will have seen me naked from about 1/4 mile away but no problem. Found a sheltered spot below the top for a naked elevenses and short nap. Met three guys after dressing for the chilly ridge and walked with them over Culter Fell and down to the track, where we went separate ways. I found another sheltered spot for a naked lunch, and then walked naked all along the reservoir meeting nobody. Surprised to find a few houses near the dam so put the wrap on for a while, then braved the tarmac single-track lane nude. A car came towards me, too late to wrap so I just held the map in front of me, and the 60-ish lady driver just smiled. Then she came back the other way - must have just dropped something off at the houses - so she saw my bare bum but there were no consequences. Further on there were two more couples so I dressed for the last mile or so. It seems people park and do short walks along the road, taking advantage of the lack of traffic. Overall 3 hours nude out of about 5.

Sunday's walk was planned to be the main route from this site:

https://www.stevenfallon.co.uk/trahena.html#

I actually skipped the return loop of hills because the wind was cold and I was not fully equipped, but I had a naked hour in a sheltered hollow below the trig point. In about 4 hours I met 4 people, so I reckon nudity is possible anytime up there, possibly even walking the whole of the John Buchan Way, but the cold wind may have put some Sunday walkers off.

I now hope to return when it's sunny and less windy.