WELL! I took the Fiesta for a spin down the road to a friends (quarter of a mile) then back not too long afterwards. The steering had been fine the whole way there and the whole way back until I was on the driveway reversing then the power steering went heavy, the mileage came up as ------- and the steering wheel light with an ! beside it remained lit on the dashboard. I turned it off then restarted it and it was still the same.
I've looked underneath however I cannot see a puddle of fluid or whatever.
The Fiesta is of the van version 2010 1.4 TDCi Base 68