Have you had a look to see if there's damage to the bark on that branch?
Looking at the photo the top left looks a bit yellow as well, is it?
lovely, thank you Dove
yes please Dove
I like raspberries
I'd say raspberry. looks more like that than blackberry
good point H-C
ideas of world domination.
a photo would help with some elimination even if it can't make a definite ID.
Link to the article Mike mentions
It can only be invasive by seeding wakeshine, the roots don't wander. But it's too easy to lose in a lot of gardens given a cold wet winter.
If only Punkdoc
But I don't watch and don't know who is being complained about half the time. What a sad life I lead with no TV and no celebrity presenters to complain about