At £80 try Torchy the Battery Boy. I've bought his lights over the years and been very satisfied (the site links to an ebay store). http://www.torchythebatteryboy.com/
thanks guys. at the moment I've had to put the lights on hold as need to spend £80 fixing my bike now. Hopefully will raise the money again and be able to get something. If not, lots of batteries for my solarstorm.