bought this after a recommendation on here:

LINK

but it came with a tiny power cord, roughly about 1/4 a metre. The battery pack is like 4 AAs sellotaped together so fairly heavy so I wanted to hook it onto my waist but the cord will only allow me to put on the back of the helmet, which looks stupid and makes my helmet even heavier. Does anyone know where I might get an extender cord as such or what to search for on ebay that would give what I need? I’ve emailed the seller and they have nothing to provide, uselss!
thanks.

Try having a look on http://www.magicshineuk.co.uk/category/bike-lights/bike-light-accessories/

splendid Jon, you’re a star thanks