It looks like Aubrieta we had some on our old wall growing.

Fairy Foxglove (Erinous alpinous), a lovely little alpine plant.

Thanks folks.
It Googles as fairy foxglove right enough.
Very pretty.

Looking closely at your pic, Sophie, I wonder if you have found this in a naturalised location near to home? We once found it south of Oban on the Bridge over the Ocean (Clachan Bridge). We had planned a walking holiday based in Oban but it turned out to be the time that Foot & Mouth hit so we were very limited in our activities.

yes it is and it is wonderful. I grew a plant 8 yrs ago and it is still producing self seeded plants.

Hahaha , well done Bulbaholic, the pic is in fact the Clachan bridge.