So I've just got the Remington Colour Protect straighteners for an amazing £14.99 from Aldi & they are the bee's knees!
They are dare I say it just as good if not better than my GHD's. my hair is medium to thick with a slight kink to it, coloured & if left to dry naturally & not straightened would look like James Mays.
They have a variable temp control from 150 - 230 degrees - so can go hotter than my current GHD's could which could be why they give a better result.
Think Argos have them on offer at £19.99, usually around £26 or so.