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Left Blairgowrie lunchtime on the Friday and walked to about halfway between Bridge of Cally and Kirkmichael where I found a pitch for the night. Saturday to a couple of miles beyond Spittal of Glenshee where I camped in a ruin near Tomb Farm. Sunday I took the Glen Beanie alternative route which tbh was the best walking of the whole trip - wouldn't be fun in poor weather, but on a fine day was a glorious stretch of high heather moorland, about as good as it gets. I saw a couple of lizards up there so would guess that there are probably adders around too though I didn't see any. Sunday night in the excellent welcoming hotel at Glenisla. Monday was mostly pretty easy walking and I made it back past Bridge of Cally and camped by a hut just past the point where the circular walk closes - this was the only midgey pitch I had. And then Tuesday morning back to Blairgowrie in time for lunch.
All in all a good outing. The northern moorland part of the loop is more appealing than the southern more agricultural/ pastoral half. The leg from Blairgowrie to Bridge of Cally wasn't that exciting, and could quite reasonably be missed out altogether (there is an alternative route returning from Alyth direct to Blairgowrie, but it would be a shame to miss the Bamff estate). Waymarking was mostly good but could not be entirely relied upon. The guidebook was okay but as is often the way completely useless if you are (or think you might be) off the track at all, so I wouldn't have wanted to be without the OS backup. Paths were variable underfoot but no real issues, and most stiles have been replaced by gates. There are a few longish stretches without burns, so if you need water (I had the dog with me) then you need to make sure you don't run out.