I've scanned 2 relevant pages from their price list

Thanks for that!

The Sheng Li, which looks just like the thing I'm looking for is actually
the cheapest. 14 quid per square metre, just like the B&Q stuff. I'll
probably go along and compare with the other shades, though. I can't get
much of a feel for the stuff from a web site.

The Sheng Li is also wear rated for 6 (heavy interior/exterior commercial
use) rather than 3 (moderate interior/exterior domestic use) for the bamboo.
The large colour variation is an advantage.

Christian.