Chris Hogg wrote:

Onduline?
https://www.wickes.co.uk/Onduline-Bl...x-3mm/p/240039

What's on sale in Wickes isn't Onduline (or wasn't a few years back)
it's Coroline, which is a bit thinner, surprised they haven't been
pulled-up for it (or maybe they have actually changed what they sell?)