This list is suggests some plants that Slugs and Snails seem to be less keen on, they are good ones to try, some will work better for you than others.
Acanthus
Agapanthus
Ageratum
Ajuga
Alchemilla
Allium
Alstroemeria
Alyssum
Anaphalis
Anchusa
Anemones Japanese
Anthemis
Antirrhinum (perhaps)
Aquilegia
Arabis
Argyranthemums (perhaps)
Armeria
Artemisia
Arum
Aster amellus,
Aster frikartii
Astilbe
Astrantia
Aubrietia
Azalea
Ballota
Begonia
Bergenia
Bidens
Calendula,
Camellia
Campanula
Centaurea
Cerastium,
Cheiranthus,
Cistus,
Coleus
Corydalis
Cosmos (maybe)
Crocosmia
Cynara cardunculus (Cardoon)
Dianthus
Dianthus barbatus
Diascia,
Dicentra,
Digitalis
Echinops,
Epimedium
Erigeron
Eryngium
Erysimum
Eschscholtzia
Euphorbia
fennel,
Ferns
Filipendula
Foeniculum (Fennel)
Fuchsia
Gaillardia
Gazania
Geranium
Geum,
Grasses
Gypsolphila
Hebe
Hedera helix
Helianthemum,
Helleborus
Hemerocallis,
Hesperis (Sweet Rocket)
Heuchera
Houttuynia
Hydrangea
Iberis,
Ilex
Impatiens
Iris
Lamium,
Lantana,
Lavandula
Leucanthemum,
Liatris spicata
Lilium henryi
Lysimachia punctata
Melianthus
Myosotis
Narcissus
Nasturtium (perhaps)
Nemesia Confetii (perhaps)
Nepeta
Nierembergia
Oenothera
Origanum
Oxalis.
Paeonia
Papaver
Papaver nudicaule
Papaver orientale
Pelargonium
Penstemon (perhaps)
Phlox
Phormium
Phygelius
Physostegia
Polemonium,
Polygonum
Portulaca
Potentilla
Pulmonaria
Pyrethrum
Rhododendron
Rhubarb
Romneya coulteri
Rosa
Rosemary
Rudbeckia
Ruta (Rue)
Salvia nemerosa
Salvia officinalis
Salvia Purpurascens,
Salvia suberba and
Salvia x superba (Sage)
Salvias, the sub shrubs not the bright red bedding ones
Santolina, Lavender Cotton
Saponaria,
Saxifraga
Scabiosa
Sedum
Sempervivium
Sisyrinchium
Solidago
Stachys
Tanacetum coccineum
Thalictrum
Thyme
Tiarella
Tropaeolum species (Nasturtium)
Tulbaghia.
Tulipa
Verbascum
Verbena
Veronica
Viburnum
Vinca.
Viola cornuta
Viola odorata
Vitis
Yucca
Zantedeschia