cath - what about the classic dry shade combination of aquilegias, alchemilla mollis and cyclamen hederifolium - you could add in wood spurge, woodruff and either geranium nodosum or geranium macrorrhizum 'Ingwersen's variety', which are bombproof. Silver lamium/vinca minor are good ground cover too. Is there anything you can do to break the wind?
I have a problem front garden - house is on the site of an old quarry, and the stone isn't far below the surface at the front (but miles below at the back, fortunately). Not even weeds would grow there. It's taken a few years of applying compost, but now things are starting to thrive- but it's taken 5 years and a lot of faith! Sometimes with very challenging conditions I think it's a work of adding, adding, adding organic matter.
anonymous - if you just want to plant one thing and leave it, something like pachysandra might work! But it does seem like a bit of a shame. I am a bit evangelical on this subject, though! So many people complain about damp, claggy conditions, but there are so many neglected yet gorgeous woodland and bog plants that like it. I am a believer in the idea that there are plants adapted for every niche in a temperate climate, and it's just a matter of finding the right ones! 
book - sorry about the cough, hope the fresh air helped and that you're able to get sleep - nothing worse than being kept awake hacking away.
This week I am going to try to sow at least 2 things a day and to pot on one. I am behind, and I need to catch up. Today - sowing tomatoes and broad beans (I'm so much later with the latter than I'd like to be) and potting on Arisaema candidissimum. (I'm growing this and Arisaema consanguinum from seed).