That's actually very useful to know. Thank you.
Well if there's a chance you might be relying on my information I should probably give a bit more detail.
The boulder mush-hall is almost at the end of the spike in my route. Behind it you can see a gate/fence and beyond that is the farm track which comes from your junction. So your road isn't actually blocked at that point. I only went about 50m on your road but don't recall it being tarmac at this point, although it was better than what was behind me and passable on 28mm road tyres.
Behind me was a very overgrown track which leads from a new fishery (blue blob) which was dug but not flooded when I past. Presumably this was the source of the puffball.
The new fishery appears to be getting built by the owners of the Drumtassie(?) fishery to the west (Pink blob) this has been open a few years but doesn't yet appear to have been mapped. However the change in the wind farm access road which lead to the weird zigzag on my route has now been mapped. The fishery is visible on satellite views.
Hopefully that's slighty more dependable information but if you have any questions then don't hesitate to ask.
Alternatively if you meant the gala information was useful then I have no more details, I don't even recall which song they had blaring from the back of their van as they danced down the road.