I agree - a product that is built around a P7 LED is the way to go. That is what the Magic shine is, geomangear.com will ship to the UK but you must pay the import fees. You can also get it on ebay - the seller says they will ship world wide. It does have the battery bag (that apparently some hate). I have used mine last winter, then in the spring after the ice melted and so far this fall - riding at 6AM two days/week. Never a problem, seems great quality to me. My only complaint is you have to disconnect the battery pack from the light to charge it and when you are not using it and the connector on mine is stiff.
I have heard of people who have adapted P7 flash lights to the bars or helmet and gone that way. BTW - you can get a helmet adapter for the Magicshine, I am considering that for night hiking.