Just popped in to my local 'Focus' DIY store and RING, the electrical lighting people, are now producing their own mains voltage GU10 LED bulbs. These come in the normal varieties of colours, including (bluish) white, have a 50000 hours rated life expectancy but, best of all, they're dimmable as well. Cost for each is pretty reasonable at £8.99 each. There's no wattage equivalent given on the packaging, but I'd expect them to be around 15 watts given the amount of LED's in the lamp. Handy for those people who'd like to give LED lighting a try without the hassle of ordering blind.