leaf 14cm long by 7cm wide , very rich dark green .
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I can't see clearly but it looks to me like the leaves have unequal bases. Looks more like an elm to me.
I have changed my mind about Hornbeam and now think you could be right about an elm. The leaves are too long-stalked to be hornbeam but, as you say, the pictures aren't clear enough to see the leaf-base and the extent of inequality.
The leaves are also too large for hornbeam. At that size they'll be Ulmus x vegeta or Ulmus x hollandica.
Lat/Lng: 52.9704, -3.168
OS grid ref: SJ216420