What is this plant, please?

[LemonJuiceFromConcentrate]

It’s growing on a wall near my house and I covet it whenever I go past.

grr, pic has turned 90 degrees in uploading, sorry

It is Aubrieta - actually a member of the cabbage family, lots of different varieties ranging from maroon to purple to lilac in colour and with both small and large flowered cultivars. Likes dry conditions and, as per your photo, hapoily grows in crevices in walls

Thank you! So brilliant to have a proper identification. I like little self seeding clumpy things.