Alpines

Ajuga, esp A. reptans 'Multicolor'
  

Bulbs

Anemone blanda
Bluebells
Crocus sieberi 'Bowles White'
Cyclamen coum & C. hederifolium
   

Eranthis
Snowdrops
Tulips, eg Shakespeare, Stresa & Princess
Irene

Climbers

Hedera 'Paddy's Pride'
    

Herbaceous Perennials

Bergenia
Heuchera
     

Stachys
Viola

Shrubs

Abeliophyllum distichum
Abies procera 'Glauca Prostrata'
Buxus
Calluna 'Silver Knight' & C. vulgaris
'Gold Haze'
Chimonanthus
Conifers
Cornus
Corylus
Daphne
Erica carnea 'R B Cooke', 'Myretoun Ruby', 'Springwood White' & 'Vivelli'
Euonymus
Garrya
Gaultheria
Hamamelis
Hebe pimeloides 'Quick Silver'
Hollies
Jasminum nudiflorum
Juniperus communis 'Compressa'
Leucothoe
Leucothoe walteri 'Rainbow'
Lonicera 'Baggersons Gold'
Lonicera purpusii 'Winter Beauty'
Luculia
Mahonia japonica
Mahonia media 'Charity'
Pachysandra

Pansies
Phormium
Pieris
Pittospermum teneifolium 'Tom Thumb'
Primroses
Primula
Pyracantha
Rhododendron mucronulatum
Salix
Sarcococca
Skimmia
Spirea 'Fire Light'
Sophora
Sycopsis
Taxus baccata
Viburnum bodnantense 'Dawn'
Viburnum tinus
Vinca
Yucca

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.