In reply to Hertz32:
Would recommend the moon Saturn, I own three and a new Warrior the foam and build quality of the current incarnation is absolutely spot on.
In contrast I am not a fan of snap pads, they didn't stand up to the punishment of a two week trip whereas the saturns and warrior are plump and still going strong.
I strap two saturn mats together and BA take them as a piece of the luggage allowance. Two saturns and a warrior plus two big expedition style hold-all bags fit into a VW polo (in a fashion). My Ford Focus takes all the mats as my regular crag car, two can fit in the boot, leaving the back passenger seats free if needed, I think your Micra should be ok for one Saturn or similar.
Keep an eye out on bergefreund website, the saturns are selling for £225.
I have not owned an organic pad, but they look and feel great. I don't think you can go too badly wrong between the two.