Called the guy, but he had posted it for an old friend so couldn't answer some of the questions I had after asking uncle google a few questions.
So rang owner, he could barely hear me (age), agreed to meet next day, and off I went into The Cradle to look at this.
Love at 1st sight. Runs like a beaut, the guy is passionate, and is just trying to "get rid of stock" - just too many licenses to be paid annually. "Everything works" he tells me. Yet to drive her as carb was giving issues - diaphragm gone, so he's busy building new one for me. I didn't even talk him down on his price. He's not trying to make money - this is a practical give-away as it comes with COMPLETE spare motor that's running - came out of another that's in the yard but scrapped. Bugger, you might wanna have a look at this a/c my boet

I love the cockpit!!

This is so original it's not even funny

Yet to give her a name, so any French suggestions will be appreciated. Something African in French due to where this car has been living - Cradle of Mankind.
Wikki says http://en.wikipedia.org/wiki/Citro%C3%ABn_GS
"Good aerodynamics enabled the car to make the best of the available power, but the car as launched nevertheless drew criticism that it was underpowered. Citroën addressed the issue with the introduction in September 1972, as an option, of a larger 1,222 cc engine. Claimed power increased from 55 bhp (41 kW; 56 PS) to 60 bhp (45 kW; 61 PS), but it was the improved torque that really marked out the more powerful engine, and which enabled the manufacturer, with the larger engined versions, to raise the second gear ratio and the final drive ratio, increasing the vehicle speed per 1,000 rpm from 23 km/h (14.3 mph) to 24.5 km/h (15.2 mph)"
Here's how they sounds on the tube: