I had some other panels I needed so didn't actually place the order till Sunday afternoon using their website (http://www.clickmetal.co.uk/), and they arrived today; Tuesday, so two days is pretty good service in my book. The panels have a peelable protective coating on one side which is nice. All I have to do is measure and drill the mounting holes and I can then reuse those old, and rather expensive project boxs.
Because of the £10 delivery charge, it makes sense to order everything you need in one go. I think delivery is free if the order value exceeds £200 - but that's a lot of panels.