Friend or foe?

Spotted this alongside my Astilbes. Going by the amount of growth it's quickly put on I'm thinking it maybe a bit of a thug that I need to remove? There again it could be something that's self seeded that I don't recognise. Any ideas please?


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that looks like the native Common Elder Sambucus Nigra.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.