I have now idea how you would i.d a bird skull
so any help would be great
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It would be good to know what length and width the bill is - I agree this is a member of the pigeon family, but looks a bit bulky for a Collared Dove. Details of size might help confirm whether this might be a Woodpigeon
Lat/Lng: 51.23236, -0.3511
OS grid ref: TQ152494