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Cheers, good suggestion to get a mix. I'm thinking a rambling rector rose, and maybe a clematis armandii apple blossom for the evergreen...
Passion flower and rosemary also a good shout. I'm think of putting them in those massive fabric grow bags so it might be high enough for the rosemary to just have to tumble over rather than growing up-and-over.
I have two star jasmines I have just planted in the garden with the aim of growing then over an arch... I had heard they were pretty vigorous, I hope I have better luck than both of you.
lemonade-
I wouldn't go for rambling rector, they are very vigorous and it would quickly overwhelm that wall and scratch people passing! It's also a bugger to prune due to huge thorns. I'd go for a repeat flowering climber if you really want a rose. something like this https://www.davidaustinroses.co.uk/products/blush-noisette
Solanum jasminoides is a super fast grower and will cover that wall quickly and it's very pretty, polinators love it too
YAFJ
On paper star jasmine sounds like a good idea.
Mine have been incredible slow to establish and I've only ever had one flower on one plant. But you might have better luck.
Once established the leaves are nice and go a reddy tinge on the smaller leaves this time of year.
Maybe try a combination of a rambling (not climbing) rose with an evergreen.
If you can work out a way to mount them high up there's a really nice variety of cascading rosemary which is both evergreen and smells nice.