Lights

Thanks all. Went with one of thesehttp://rover.ebay.com/roverimp/1/710-53481-19255-0/1?pub=5574889051&toolid=10001&campid=5336525415&mpt=[CACHEBUSTER]http://rover.ebay.com/roverimp/1/710-53481-19255-0/1?ff3=2&pub=5574889051&toolid=10001&campid=5336525415&item=261515386637&mpt=7089451 in the end. For £15.50 shipped...we'll see what happens. I do have a couple of other less powerful lamps that will hopefully serve as a back up. Failing that, I'll just eat lots of carrots and nail the ride before the battery pack runs out (wishful thinking)

I see that the item you have chosen has a two cell battery pack. (The wording is fairly ambiguous in the listing so I may be incorrect) This will obviously half the run time compared to the more usual 4 cell battery pack such as comes with this
http://www.ebay.co.uk/itm/CREE-XM-L-XML-T6-LED-1800-Lm-Bicycle-bike-Head-Light-Headlamp-Rechargeable-Head-/191158279393?pt=UK_SportGoods_CyclAcces_RL&hash=item2c81ebdce1http://rover.ebay.com/roverimp/1/710-53481-19255-0/1?ff3=2&pub=5574889051&toolid=10001&campid=5336525415&item=191158279393&mpt=[CACHEBUSTER]