Photos poorly resolved but key features such as a glossy cap and white on the beak indicate that this is a marsh tit.
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I agree, but the glossy cap is not a reliable feature on its own. However, in combination with a neat bib and 'dirty' rear cheeks, it is a Marsh Tit. I don't think it's easy to judge the pale cutting edge on the beak from the distance of this picture.
My Flickr photos...
Lat/Lng: 50.4, -4.1
OS grid ref: SX5259