Fred,
Whichever you choose, you might want to shop around the dollar stores before you pay a premium price like that. I know you're in the UK, but here in the USA those high-intensity LED "spotlights" are available at Big Lots for the dollar-equivalent of 3-4 quid.
24 pounds sterling just sounds a wee bit profligate
And, hell, if you find them cheap, get the bright ones!
The other option you might want to consider is a CFL, or compact flourescent. They are almost as cool as an LED, and you can get spotlight-style configurations. There's a company called Lights of America that makes a model R40-2948, which is a flat spiral of fluor tube with a built-in reflector. Big Lots again, at the dollar-equivalent (figuring $1.60 to the pound) of 3 and a half pounds. This sucker takes about 3 minutes to get up to full brightness, but it is
bright when it gets going all the way, and only pulls 30 watts of power.
I know full well all this US-made stuff is 120V and useless on UK mains, but my point is just that there should be a UK equivalent, for those of you who use funny plugs and dangerously lethal power
