Hi David, What a lovely bird to have visit your garden and I agree with Rob that it is an Lesser Whitethroat which is pointing downwards; to help I have added a photo of one I took a few years ago ......
not the best of photos but enough I think to give you the overall impression
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Regards, Hazel
"Each kindness shown to birds or men is sure to flutter back again"
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Beauty is in the eye of the beholder.