This morning 2 flew north along the east ridge beside Cors Caron calling as they went. I've never heard Blackwits make any noise in Britain being usually way off or got their heads down in mud or their feathers but we did spend a magical night camped in the middle of their breeding meadows in Sweden....
ps. it was legal, you can park a camper on their reserve carparks but you'll be alone if its in May.