Possible hybrid willow or Almond-leaved? Leaves much broader than Crack Willow
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I agree, it might be pentandra but the leaves are long and quite symetrical giving me doubts.
Unusual for Robert not to mention the mining - is there another post somewhere?
Now see mine http://www.ispotnature.org/node/693629
this really is S. pentandra, very good example, very good pictures. The hybrid S. x meyeriana is much more common and (very) often mistaken for it.
Lat/Lng: 52.0332, -2.161
OS grid ref: SO890372