ID please?

This is a rock plant from Morrisons marked only 'Rock Plant'- very helpful. Leaves are alternate, pointed oval shaped, smooth edged and start off dark red becoming dark green as they open. 4 very bright pink petals on each flower, flowers about 1/2- 3/4" across, no smell. It has begun to throw out runners.

 

Liz, it looks like Centradenia (which isn't a rock plant) I thought it was usually sold as a patio or tub plant. It is frost tender and usually discarded at the end of summer like most half hardy annuals.

 

Ah- that's why I couldn't find it... didn't think it might not be a rock plant! It's very pretty, and has a lttle wall in front that it can grow down if it gets big enough.
Thanks!