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In Great Tits, the width of the black stripe where it meets the legs helps to sex them. In males, the stripe is broad and clear (often expanding between the legs); in females, it is fading away at that point. This is clearly a male, then.
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Many thanks for the info Ian - that's interesting to learn.
Lat/Lng: 57.16, -2.2
OS grid ref: NJ880076