Ok, I may be wrong in that the frame of the D10 is hydroformed. A review on the not-always-terribly-very-accurate Folding Society site says the frame is 'mono-coque', made from two halves then welded together down the centre. The weight, it is said, at about 12 Kg, is about the same as the D9 but the bike is meant to be 'an upgraded' model, hence the ten-speed upgrade.
Thanks to Omiak for mentioning Ori bikes which, I understand are made by Ori - the factory who make the Mezzo, and are sold under licence.
Ori's seem to be widely available in the Mysterious East.
Here's the product line-up. Yum!