Hi Nick,
I successfully saw the Great Grey Shrike at Red Moss today, so it all paid off in the end :t: . It was viewable 200-300m south of the Lairhillock turn off on the B979. I spotted it on top of one of the trees at the side of the road whilst we were driving along so we didn't have to turn off and follow the directions given on ABZ, making it was much easier than I expected - a stroke of pure luck. It mostly favoured an area of young sapling trees not very far away from the road, but was quite mobile. I also had it in the fields on the otherside of the road. I really wasn't expecting it to be around, but its fantastic that it is. I've got some pictures attached below (managed to get within 40ft when it was on the otherside of the road), although they are pretty poor due the low light levels. Hope it is still there when you go on Tuesday.
ATB,
Joseph