Hi Steve, I was interested in this when it was for sale last year, and did some research at the time. It looks like the one on p14 of the attached doc I turned up...
http://www.camdencen.org.uk/download...ity%20v13a.pdf
It was done as a conversion (I did find out the the converter, but can't seem to now) as the P3 S80 and V70 Flexfuels were only petrol / ethanol for the UK market (like the red one listed in your Autotrader link) nevertheless it should be cheap motoring!