SoS[23] - opening the new leaves

I think that this is a sycamore twig [Acer pseudoplatanus] with the newly opened leaves still heavily crinkled as they expand from within the buds.

Not strictly speaking "native" but rather "naturalised" in the British Isles, sycamores can, and do, grow like weeds un many areas. They are problematical as the seeds contain a substance that is a cumulative poison to sheep, cattle and horses. The trees grow very quickly, are difficult to eradicate completely and seed very profusely once mature.