I don't remember seeing this last year, and it looks quite similar to poison oak - which I've never seen in person before.
Location: Southern UK
posted 3 years ago
Can't be sure, but I'd guess at Lonicera japonica, Japanese honeysuckle.
The leaves a very variable, change shape and appearance at different stages of growth. If you google it you'll at first say"nah, it's nothing like that", but keep looking and you'll find some pics that look similar.