Recommendations for climbing plants, please!

Roses? Good on clay. Loads to choose from.

Either summer or winter flowering jasmine?

Thank you very much Ladies, some really good suggestions to look in to.
Bluebell, thank you for the offer of seeds. Very kind. I may be in touch! Thank you.

If you wanted I could send you some seeds x

My Morning Glory have been such a joy to me they flower and flower they grow up a trellis I collect the seeds and plant for next year

As above, plus, Honeysuckle, spring flowering (scented) Montana Clematis, Trachelospermum Jasminoides, to name a few!

Jasmine works well and is scented. Everlasting sweet peas would romp away up the trellis - very pretty, but unscented. Clematis - check varieties as they flower at different times.

I had just come back to mention passionflower!! We cut ours right back most years!

I had to cut down a beautiful passion flower last year because the gas board wabted to put a meter on the wall - but I was very happy to find that it has grown apace this summer; it produves beautiful flowers and I do nothing to help it other than attaching tendrils to the trellis - I can wholeheartedly recommend!

Pyracantha do well on our clay soil as does flipping ivy! Actinidia is now doing well after a shaky start.