The snag, of course, is that this looks a bit naff, and in some fittings won't be practical because the shade will get in the way. So far I've done one light, which doesn't look too bad because it's a big wide shade, but the others will be trickier.
Can anyone point me at a source of adapters that are bayonet to two bayonets (and possibly bayonet to three bayonets for one room) that aren't huge, ugly, or hideously expensive?