Centaurea 'Silver Feather' PBR:
A choice perennial with fluffy lilac-pink flowers over beautiful silver finely divided foliage. Evergreen. Full sun and good drainage. To 40cm. Hardy.
Geranium nodosum (Knotted cranesbill):
Fast spreading hardy geranium with purplish pink flowers over a long season in summer. A great gap filler. Up to 50cm.