Marsh Harrier - Harland Edge

Watched a cracking juvenile Marsh Harrier sparring with a Buzzard along Harland Edge yesterday. 
It's only about the 4th I've seen over the moor. It's a mystery to me why, when the number of Marsh Harrier have increased dramatically in England over the past 20 years, they are as scarce, if not scarcer on the moors now than two decades ago.

Marsh Harrier - juvenile