Damp shade and London clay - what to grow?

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I’ve just laid newspaper and mushroom compost over the beds in my small, north facing London courtyard garden.

I have no idea what to plant though! I have two camellia bushes (one 3m tall) and a rose bush that love our soil, but no idea beyond that. What would grow well in damp, shady London clay? Especially things I can plant now to flower in summer?

www.telegraph.co.uk/gardening/howtogrow/3314028/How-to-grow-Malva-moschata.html

I have loads of these growing in my shady London garden. Really easy to grow from seed.

Nigella also seems to do well and is extremely pretty

(NB I know it says that malva moschata needs sun but my garden is NE facing and they do fine, lots of flowers)

BadCatDirtyCat thank you, Malva Moschata are really pretty. That’s exactly the kind of advice I need - so much I’ve researched requires full sun so it’s good to hear they do well in your NE facing garden.

Np. I also have a fuschia which does well, even in a very shady area. They're a bit 80s looking but nice and bright and flower all summer and into autumn.

I had a hydrangea in a London courtyard garden with zero sunlight, and it seemed quite happy.

Astilbe, Astrantia, perennial cornflower, helleborus (in flower now but the "petals" are in fact bracts and will last for months)