So I decided to use the old 'dartboard' method as a way of selection. After carefule deliberation, these were likely candidates :
Patriot Hannibal Safety Devices Bearmach BA123+123A Frontrunner Windcheetah
The Bearmach is about 200 quid cheaper than the others.
So I just pulled one out of a hat. And the winner is...
The Safety Devices new expedition roofrack (as seen on G4). I also ordered the fixing kit and template to make up your own floorpanel.
Oh well...
Petrer R.