West facing seating area

Its; the fragrant bit that's giving me pause for thought. If you want low growing plants for between slabs in the way you describe, and it's west facing, things like lavender might not like the reduced amount of sunlight available. I'm thinking Campanula muralis underplanted with fragrant narcissus for the Spring. Hebe youngii (not fragrant though) Heucheras, the purple leaved ones or the marble ones or "Limelight" again, not fragrant, but will do well in such a place. Fragrant lillies like L. regale (if you keep an eye on the lily beetle situation). The annual white alyssum, which seeds itself, is fragrant, but prefers quite a lot of sun.

Thymes would be good....lovely fragrance when you walk on them. and don't sprawl too much if you keep them trimmed.....especially for coooking :))

I thought herbs too but dont use too many in cooking and always thought they needed loads of sun. I like the campanula and narcisus bamboo - didnt think about combining with some bulbs for the spring. I suffer with lilly beetle now which is a shame as I love lillies.

You're right, geniuscuffy, herbs do need loads of sun. Lavender Munstead Dwarf might be worth a try - they're relatively cheap so if it doesn't work too well, you've not lost much. But Heucheras will love the situation, as will Geraniums (Cranesbills, not Pelargoniums) and there are loads of those, but most disappear in the winter - check out the low growing rockery types, they tend to retain their leaves, like G. endressii and similar. But they're not fragrant!

If you were to put some sort of support on that back wall, it would be an ideal spot for honeysuckle.
Mentha corsica, a creeping form of mint, may do better than thyme beween the slabs as the latter needs full sun and well drained soil

I like the idea of honeysuckle - I went and brought an arch today but not sure whether to use it as an entrance or over the bench? -If I used it as an entrance the plants would get more sun but behind the bench would give me more privacy! (overlooked as I live on an estate)

Not sure about the mint, Andrewr - creeping it may be, but it'll creep everywhere if not contained won't it.
And Genius, you could also try Akebia quinata as a climber - tolerates more shade, then you could sit under it - the flowers are tiny but smell a bit chocolatey. Google it and you'll find a pic I expect

Honeysuckles do better with part shade; in more sun they are more prone to get aphids. It sounds as if putting the arch over the seat would suit them better as well as giving you privacy

Updated the pic - and decided the arch looked better in front! My poor son kept going backwards and forwards!!!

Boy, that looks so much better! And how the devil did you replace the picture?

At the bottom it says update your question and just went onto photos - I thought it would add it at the bottom but it just replaced it - you are as surprised as I was!!