I have these lights and they are really good, really bright. 49.99 with free postage.
These are highly reviewed lights in several recent cycling mags. 240 lumen output (120 lumen per unit), lithium powered. Front only. Nb the newer model is 160 lumens per light but £109 on amazon. 120 is still way bright!
High power Seoul LED
Li-Ion battery pack
240 lumen output (120 lumen per unit)
High, Low, Flashing
High: 5 hours, Low: 20 hours
Includes UK mains fast charger
Batt Life indicator:
Low battery indicator provides warning to make sure you're not caught out in the dark
Quick Release handlebar mount for lights, Versatile stem or frame mounted battery
Previously £54 here http://www.hotukdeals.com/deals/evans-cycles-electron-terra-2-front-light-with-code-10offbas-spending-75-1165925
There is a coupon code but I don't think it works with lights
SALE10, 10% OFF clothing, parts & accessories. Enter code online. Cannot be used in conjunction with any other offer, discount, or when paying with Price Match. Excludes Altura, Endura, Exposure, Garmin, Motorola, O'Neal, Specialized, Cameras, Forks, Gift Vouchers, GPS, Groupsets, Heart Rate Monitors, Ride It! Events, Turbo Trainers and Wheels. Valid from 11.05.12-TBC