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Super day - sunny, a breeze and not too hot. Did the circuit as described here. Most of the way is a gentle climb on a hill track, crossing some fords then a steeper section to the trig point - the highest point in the Lammermuirs. Great views. As said here the track after the trig point is unclear at best. Definitely went off the beaten track a few times. Luckily the terrain was very dry - it would be a nightmare of bogginess if wet. Eventually I found the vehicle track as suggested which eventually joins the bulldozed hilltrack that leads to the wind farm - turn left where it meets the wind farm track as if you turn right you head back up the way you came! Finally back down to Faseny Cottage. The absolute worst part of the day was the really steep climb past the cottage up to the road - not fun after walking 6 miles.
Some photos - definitely the Lonely Lammermuirs. Saw no one the whole time - just grouse, hares, sheep and lambs and skylarks. 3 hours of pure mindfulness!