Erm.... not quite, Raksha. Buzzards also hover, but obviously with slower wingbeats than the Kestrel. Believe me, I've seen 'em doing it!
Walsy, it definitely hovered so I'll go along with the Kestrel idea, since I can't find anything else that looks most like what I saw. The wings were very finely pointed to the tip, which is why it put me off thinking it was a Kez. But, if it isn't a visitor from Europe, I'll assume that's what it is. The size and wing crescent-shape was more Hobby-like, but I realise that they're not supposed to hover, so will discount it. Just too bad it was in silhouette against the sun, or I'd have got a better idea of colouring.