Slightly tricky to judge from the pictures as they are not terribly focussed. But agree with Terry T, some kind of rubus does it have pink flowers and yellow raspberry looking fruit ? As I guess it could be salmon berry ( Rubus spectabilis) which is an garden escape in the NE of Scotland and can behave like a weed. In Kerria japonica the stems / twigs are green and thornless and yellow pompom flowers will appear in spring.