"Kate Morgan" wrote
how about Mahonia for smell

Mahonia has prickly leaves though.
My suggestions for easy-care plants

Perennials:
Japanese anemone pink flowers August-Oct
Bergenia (elephant ears) pink flowers March-April
Echinacea (purple coneflower) pink flowers July-Oct
Hardy Geranium shades of pink/blue/lilac May-August
Hemerocallis (day lily) shades of red/yellow/orange June-August
Oenothera (evening primrose) yellow flowers July-Sept
Phlox scented shades of pink/red/lilac July-Oct
Rudbeckia yellow flowers July-Sept
Sedum (ice plant) pink flowers August-Oct

Shrubs
Buddelia white/pink/lilac/purple shades July-Sept
Ceanothus pink/lilac/purple shades May-June
Choisya (Mexican Orange Blossom) fragrant white flowers May and sometimes
autumn too
Clematis
Escallonia white/pink/red flowers (small but plenty of them) June onwards
Forsythia
Hebe
Hydrangea
Hypericum (the shrub, not the invasive ground-cover type)
Jasmine (both winter-flowering and white fragrant summer-flowering if you
have a sheltered spot)
Lavender
Lavatera
Lonicera frangrantissima (shrubby honeysuckle) fragrant cream flowers
wintertime
Pieris (if you have acid soil) white flowers March-May, red new growth
Potentilla white/yellow/pink/red flowers May-Sept
Ribes (flowering currant) pink flowers March-May
Viburnum various, esp. Bodnantense "Dawn" fragrant pink flowers wintertime
Weigela pink/white/red flowers May-June

Herbs
Sage
Rosemary
Thyme
Mint in a pot
etc

Sorry not very many fragrant ones. HTH.

Choccie