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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Difficult to be sure but that looks more like a willow to me
I was going to say Hazel.
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I think we both agree it is not birch and the growth is not Taphrina betulina like.
I'm fairly certain that the tree is the Winter-flowering Cherry (Prunus subhirtella 'Autumnalis'. If you view the original images you can make out the pale pink bell shaped flowers. So could the growth have been caused by Taphrina wiesneri?
Lat/Lng: 51.8305, -2.0527
OS grid ref: SO964146