Oh God, can't do links the mark Hill ones are in a dark pink (like cerise) box. The straighteners themselves are black and the plates are pink (same colour as the box.) It says Mark Hill clearly on the box. If you go to a large branch of Boots and head for the electrical hair section, where they have the dryers and so on, if they've got them you'll see them.
I was very sceptical after having GHD's for quite a while, but the MH ones are really good. They have adjustable temperature which GHD don't so that can take a bit of getting used to. Generally the hotter the better. They start at temp 120 and go up to 220. I have used them at 210. I think the GHD's are 220 degrees anyway, so it will be okay to use them at 210 or 220. Mine came with a nice bag to keep them in, more like a zip up case, which has a heatproof mat as part of it, and I got a 'style bible' and a Mark Hill gift card.
I've also heard good things about the Bbayliss pro 230