So I can across this product
On eBay http://www.ebay.co.uk/ulk/itm/351475083778
It was fairly cheap and seemed small enough to use. I received it today after waiting for nearly a month from China and its not bad. Ok it's not a ring light but hay what do you expect for few pounds.
It does add light (only not 100% on the centre of the picture due to were it is attached. (Headphone adapter) BUT you can still use it off camera nad hold it with the other hand. Also there is 3 power setting.