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The amount by which the red stretches back beyond the eye, above the eye, suggests it is a male. In females, the red tends to have a concave edge above the eye and not stretch back beyond it at all.
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Thank you - I didn't realise you could tell the difference. I'll take a closer look when they are next in the garden.
Lat/Lng: 51.1, -0.2
OS grid ref: TQ2744