Ajuga reptans 'Alba' (Bugle, white flowered): Superb ground cover plant with bright green leaves and white flower spikes in summer. Very attractive to bees

Fragaria vesca (Wild Strawberry): Semi-evergreen spreading perennial, small white flowers in spring followed by small sweet fruit. Spreads by runners. Hardy. Up to 25cm

Saxifraga x urbium (London Pride): Wiry stems topped with dainty pale pink flowers over ground evergreen rosettes of green leaves with creamy yellow markings.