Bright lights with a long burn time

I'm doing a long ride in a few weeks time, and quite a bit of it will be in the dead of night in the middle of Wales. As such I'm looking for a front light system which has a good 8hrs of burn time (I'll be stopping for a lie-down from time to time!) and a rear light which will be sufficiently bright to ensure country lanes (especially the corners) are well lit behind me. I've done the usual google searches but come up with very little for less than a gazillion pounds, given that this is not the norm for me, I'd rather avoid the re-mortgaging the house option! Any thoughts?
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Not all batteries are born the same. Go to someone like Torchy the Battery Boy's site and see what he recommends these days.
Specialized Roubaix SL3 Expert 2012, Cannondale CAAD5,
Marin Mount Vision (1997), Edinburgh Country tourer, 3 cats!
You'll pick one up for around £65-70.
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http://www.7dayshop.com/7dayshop-super- ... head-light
Personally I'd get 2 or 3 of these: at £9.20, charger, some mounts and some spare cells (break open an old laptop bat). You'll probably find you can run them on low and get about 8-10hr run time, med for about 3 hours. High about 1.5 hours.
http://www.lightmalls.com/ultrafire-wf- ... ch-1-18650
XM-L2 is the brightest/most efficient LED you can get right now.
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