Kestrel / windhover hunting over grassland
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Your observation that it was hovering confirms this as a kestrel. Buzzards will also hover but are much less skilled at it and have to beat their wings laboriously, rather than flutter.
Lat/Lng: 51.590839290166, -2.6353293657303
OS grid ref: ST560881
just off Old Passage, Aust between the Severn bridges