What is this tree?

[WindFlower92]

And what are the berries? Are they poisonous? In our garden and falling all over the patio, just wanted to know if I have to avoid letting DD out until the birds have cleared them all! I think it's an elder tree, is that right?

yes, elder so not poisonous.

Thanks, that's a relief!

Um - elderberries are in fact ‘mildly poisonous’ and shouldn’t be eaten unless cooked:
www.woodlandtrust.org.uk/trees-woods-and-wildlife/british-trees/a-z-of-british-trees/elder/