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need to know the SEX please
Unfortunately the sexes are not discernible from plumage. If you see the male and female together the female will be the larger bird; males 38-45cm, females 46-51cm. The barred chest does show it to be an adult, whatever sex it is.
we need to know the size ;-)
see if you can go back to the place, put a common object instead of peregrine and post the pic. The iSpot detectives might be able to help you then :-)
Isabel iSpot mentor for the london region
Lat/Lng: 52.6331, 1.305
OS grid ref: TG237090