Nearly all year round it has some purple flowers, but now the Ivy-leaved Toadflax (Cymbalaria muralis) is in full bloom. It is rooted in cracks in a rock or an old stone wall or another vertical surface, often not far away from water.
Here it grows on a rock above a moist place, but good places to look for it are also on the walls of an old wash-house or a mill-race, or on a wall beside a stream.