it's just taken a feral pigeon in my Dad's garden so I'm assuming it's female
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Yep, you're right, it's a female.
As you say a female. Lacks the red-orange colouration of underparts, red breast sides and ear coverts which would indicate a male. Also has a distinct supercilium.
Lat/Lng: 52.0537, -2.1449
OS grid ref: SO901394