I grow Euonymus 'emerald and gold' in a dry area in fulll sun and Euonymus 'silver queen up against a wall' in full sun and dry again. I grow quite a few others but I think these 2 might tick all your boxes and have all year round interest.

Thanks Drc, I'd forgotten about Euonymus, I have Emerald gaiety, and a green and gold one, I do want to grow them as shrubs though as the wall itself is covered in green and yellow ivy, and two clems.....think I'll check them out on google....:)

Potentilla fructicosa might do for summer interest - but not the red one as it fades in strong sun.

I think Berberis is quite tough. You get spring flowers and autumn berries on them.

Cytisus battanderii (Pineapple scented Broom) would thrive in this situation. Plant Nerines at the base for stunning autumn flowers too.

Thanks guys......Yes Stera, that's a good one to have, thinking about it, Mum has one that's been a real stunner all summer, definitely ticked....:))
I like Berberis Hywel, but maybe not the right spot where I need it...good choice though for the other side of my garden..:))
They sound like a great combo Volunteer, I'm making a note of the pineapple broom, also I think ordinary brooms would do well at the back.....thanks very much..:))