So I've been doing a bit of searching around, and came across these sites, which I'm recording here so I can find them later.
Elemental (I've been to their store in Spitalfields; they're also in Selfridges)
Graeme and Green (nice things, quite romantic. I love their mirrored tables, and I got my pineapple lamp from them)
Raft (lots of natural wood)
The Conran Shop (well out of my price range... those Eames chairs - sigh)
This is also a handy site: House to Home
I quite like these desk lamps (from G & G), but they seem only to have them left in red...
This is quite nice too - leather chair from John Lewis - but I'll have to check whether it's comfortable enough.