For Christmas, I'm getting my gf some hair straighteners as hers have died a death. Unfortunately, being male my areas of knowledge are limited to football, breeze blocks, distortion pedals and BBQs, and I know nothing about hair straightening technology. (Apart from 'GHDs' are meant to be good. But I don't really want to spend £90 on one present.) So... umm, any recommendations for hair straighteners around £40-ish?