Seen today at RSPB Lochwinnoch. I thought it was a warbler of some sort, but on blowing up the pics i'm leaning towards a Goldcrest (female?). In one of the pics you can see a couple of specs of yellow there, but not a full stripe, so i'm not entirely convinced.
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Regards, Hazel
"Each kindness shown to birds or men is sure to flutter back again"