Red or Black ?

Had this large raptor over whilst checking out my local Sand Martin colony, first thoughts were common buzzard on size and on raising my bins revealed a very darkish bird on flat wings, always flying away and fairly distant, i grabbed the camera a fired of a few shots before swapping for the bins.

Looking back at the pics it became obvious it was a kite sp, tho my first impression didn't match this and was puzzled on wing length, as red kite always seem long winged in flight, so alarm bells rung, was it a Black?

Couldn't make any colour out on the bird, but the fork perhaps lean's towards red kite?