Maren, this probably will not be of any help for you in the UK, but this wonderful little hardy succulent is popular (and common) here in the USA in rock gardening circles, frequently found on the sales benches of regular garden centers. If its ok, I'm going to post a little photo essay on this unique rock garden plant, and two other species, Orostachys aggregata and O. fimbriata. These plants are growing in the garden of Peter George in Central Massachusetts, USA.