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As you presumably saw it to take the photo and it is quite distant you may have some other ideas which are relevant in terms of it's behaviour, possible call/song, colours etc. It would be helpful to add these in as ID notes. Why not try making an identification yourself? A very rough guess based on size and possible tail shape are that it might, MIGHT, be a Swallow??
Feel free to look at my ongoing (hopefully improving) collection of pictures on Flickr:
Lat/Lng: 51.599, -3.471
OS grid ref: SS982899