Red Kites Rack End Standlake Calling

Being locked down means birding differently; a lot of it from the garden. Despite raptors being a long-held passion of mine, I've not looked hard at kites since moving to Oxon. Each spring local kites start whinnying a lot. Being locked in, I've been watching them perched in trees in my next door neighbours' gardens either side of me. The tree in the video is in, the good, Mr Jim Hutchin's garden! Think a pair is on territory. I've found the literature on breeding and vocalisations a bit thin (tho' don't have monograph). Need better views to age it: suspect 2cy on bill pattern. Other regular bird is an adult.