PeterS said:I looked at all sorts of stuff and was about to buy this...
http://www.dynotile.co.uk
After much research it turned out the company is half a mile from me!
I used these guys for mine- they were quite local and this meant I could pop over and buy individual tiles should I ever need then in the future.
Like the others they do warp in the sunshine but return to shape quite quickly.
Price was as competitive as any other, easy to cut and locked together quite nicely. (buy the rubber mallet they suggest as it really speed things up!! )