The third photo isn't very clear but it does show a nice silhouette.
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Not too large for a Kestrel, though, especially as it is a male. In most raptors the male is significantly smaller than the female, and male Sparrowhawk is a size smaller than Kestrel.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
I think it's a female - it's colouration isn't strong enough for a male. It's size should usually determine it's sex
It has distinct orange cheeks, and the jizz is male.
You are right on the colour being like a female, but this is a bird born last year (there are pale-edged feathers visible on the back), and so a male will still have much female-type, juvenile, plumage at this stage. If you could see it closer, I suspect that you would see one or two grey, male feathers appearing above the tail.
The only reason to consider this a male is the generally small jizz.
My Flickr photos...
I see. I guess i was going on the author's original comment of "too big for a Kestrel".
Lat/Lng: 50.7, -3.3
OS grid ref: SY1197