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...is a very different bird, with a chestnut crown on the head, white cheeks and a dark spot within the cheek patch. Very different to the predominantly grey/brown Dunnock, which lacks any white, at all.
My Flickr photos...
You can tell it is not a true sparrow by the thin beak. Dunnock is sometimes called 'Hedge Sparrow', but it is no close relation of the House and Tree Sparrows - in a different family altogether.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 51.7176, -3.1892
OS grid ref: SO179027
Again near Pen Y Fan pond.