Some plant ideas please.....

Luckygirl, whatever you plant, please think about supporting bees, butterflies and insects. The world needs these and they are declining. There's lots of helpful information online.

Lamium is low growing and comes in several varieties, including a variegated version.
Ameria, thrift is also very pretty forms clumps and is easy to grow.

I have inherited periwinkles here and they grow incredibly quickly. If they were next to a path they could become a trip
hazard.
Some hardy geraniums are evergreen. Also bergenias (elephants’ ears), some of which turn rich red in the winter (the smaller leaved varieties are easier to keep tidy), stachys (lambs’ ears) with furry silvery leaves and the shorter forms of euphorbia.

For me it's Heucheras all the way! Lovely coloured leaves (in winter too) and spikes of flowers beloved by bees. I've got at least 10 in various colours and they give me enormous pleasure all through the year.

Alchemilla can be an absolute nightmare if it likes your garden!
You might like to watch Your Garden Made Perfect on BBC2 for ideas…..though the amount of money some people have to spend is eye watering!

I have ceanothus and hebes in my raised beds. They've done well. Lavender was lovely at first but three years later it died off. Rosemary etc might be good.

Erigeron can become a real thug , I spent some time this week yanking it out where I don’t want it ! It is very pretty though . I like Hukera ( spelling ?)

How about Alchemilla Mollis?
I just love the leaves that catch rain drops and the dew. They should also clump up.

Ceanothus concha? they seem to cope well in small spaces and are a beautiful blue

Some periwinkle? Low growing Hebe -Wingletye I think.

Dark blue trailing campanula, hardy and only requires a haircut now and again to stop it spreading too much.

Thanks for those ideas - clump-forming is what I have in mind. I am making a list.

Saxifrages are good, they are clump forming but low, and pretty in the spring. I’ve got lots of the London Pride variety in my garden, which is really pretty. Pinks are also lovely and smell beautiful, as long as you give them an annual haircut. You could also try heather, depending on your soul type. Good luck!