That looks to me very much like a goat willow Salix Caprea … often self seeded into gardens by the fluffy wind-borne seeds … not always suitable for ‘normal’ gardens as they grow very large, but a wonderful food resource for all sorts of wildlife if you have enough space.
The caterpillar I can see may be one of the sawflies … but I can’t see it clearly enough to be sure. Probably destined to become a fledgling’s lunch very soon.
😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.