Ivy leaf toadflax

Saw this delightful little plant on an old wall round a farmhouse on today's walk. I remember the first time I ever came across it, growing on a wall at Fountains Abbey [Yorkshire] when we went there on a school trip. It was the last year of junior school so I must have been about 10. I thought it so pretty that I nicked a bit and hid it in my sandwich box to take home for Dad, a plant fanatic, who proudly cultivated it in our crazy paving. Remember crazy paving? That dates me [along with junior school no doubt].

I've heard that you can use the leaves in salad but never tried it. They are so tiny, would take a lot.