We have a Bay tree that has grown in a bit of a tangle with a Yew
tree. We often use bay leaf for flavouring. There is no possibility of
us confusing the leaves but today we were told that the Bay could be
poisonous because it is so close to the Yew.

I don't think that is likely but I must ask the experts in this group.
Could a Bay pick up poison from a Yew?

Steve