Definitively, this is a rear engined Fiat 850 from the early 70's. I know, because I used to share a flat with a guy that owned one: for which reason, when I get home, I may well be able to find a photo of one from my collection.
At the time, and this is mainly for Rob's benefit, I was driving one of a handful of 1969, 1700c.c. freewheel, Saab 99's, from the 1969 London Motor Show, which differed substantially from the production version. This was the first of my four 99's. Regrettably, when I had my eyes on the first of the turbos, the ad. agency that I worked for acquired the British Leyland account and we all had to have Rover SD 1's - the worst car that I ever owned. I never did get back to being a Saab driver!

Ooops!!!! No it isn't, it's an Opel Kadett from the same period, sorry, I won't go into a long explanation of what was misleading me.
N.B. It's not quite the same model as the one shown in the link.