Anemone
Ajuga reptans
Aquilegia
Arum italicum
Bluebells
Brunnera macrophylla
Candelabra Primulas
Ceratostigma plumbaginoides
Convallaria (Lily of the Valley)
(esp C. majalis 'Albostriata (variegated)
Cowslips
Crocus
Cyclamen coum & C. hederifolium
Epimedium
Eranthis
Ferns
Forget me Nots

Fritillaria
Galanthus
Geranium sylvaticum & maculatum
Hedera
Hellebores
Hosta
Matteuccia struth.
Polygonatum
Polypodium
Pulmonaria
Rhododendrons
Sanguinaria
Solomon's Seal
Tiarella
Trillium
Veratum album

These lists are by no means exhaustive. If you can think of a plant that needs adding, why not email me and let me know.