I went for a run last week to Ayrshire and Dumfries & Galloway. It was beautiful spring weather and the landscape was brightened up by yellow flowers on the bushes. I had it in my mind that they were Broom, but I remembered a field full of them where we played as children and we called them Whins. Broom & Whin (Gorse) are closely related but Whin has thorns. And these were certainly thorny.