Physocarpus opulifolius, maybe 'Diablo'
Could be Nut, but I've got Diablo D'or in my front garden and the leaves are dark brown.
Do you think it's the physocarpus Gm?
The cultivar was only a maybe
I'd agree with P O Diablo, the amount of sun can have an effect on leaf colour.
Just googled it, its 100% Physocarpus Diablo. Thank you very much guys and girls