Vicia gigantea

This is a good pink form of a Californian native vetch. In the wild a potentially vigorous coloniser but here I've found it no more so than some of the popular climbing Lathyrus such as L.latifolius, and it makes a very nice change from that with its fresh green pinnate foliage and spikes of rich pink flowers.

Even so I'd give it plenty of space somewhere it won't swamp small treasures. Spring flowering - cut it back to the ground after flowering for fresh new growth.
£8