Re: @Nick Ryan
"One downside though: they're universally Edison screw, so you will have to stock up on suitable fixtures or get adapters."
I went with LEDHut. At the time they were about the only UK supplier with a decent range of UK standard fittings types and included dimmable LED bulbs (so long as you use the correct type of dimmer switch). The only downside is the range of the dimmer is a lot less than I'd like, ie you can only dim down to about half brightness.