Hi Rob,
I've spoken to Tinman a few times trying to arrange delivery to Scotland (which he couldn't do unfortunately) and he seems like a genuine, honest seller. The sheets are pretty much the same the country over
I ended up getting some up this end of the country 0.5mm steel, coated with green paint and lined with a no con-drop coating for around £40 for an 8 ft wide & 4 ft high curve, his prices are a wee bit cheaper though. If you search the forum, there's a thread somewhere called 'Step by step pig arc assembly' which shows how we put them together, in fact, I'll have a look for it and post a link.
HTH
Karen