The Harrier should be Pallid on face pattern (distinct crescent on ear-coverts joining stripe behind the eye and also meeting base of bill and relatively weak white markings above and below the rear of the eye), pale, if not white collar and dark "boa" on the neck. I'm not 100% sure, though, as there is some variability in these features. Dark carpal crescent better for Pallid, I think. However, lacks barring on outer primaries and secondaries look dark.
Any other opinions?