Well I had the car collected from the drive on Saturday lunchtime and had it taken to the guy that repaired my inlet manifold for me. I'd made several phone calls during the course of the morning mind, I didn't just turn up unannounced
He started having a look at it immediately so I hung around for a couple of hours to see what he discovered. The loss of power steering fluid was due to a split hose on the return to the cooler. If you look in through the near side fog light grille on the left side you can see two hoses, it's the smaller diameter of the two. The hose was in poor condition for about the first foot of its length, which also has two 90 degree bends in it due to its route back towards the steering rack. He suggested the poor condition could be due to the exposure to weather and cycles of temperature because further back into the engine bay the rubber was fine, still soft and flexible with no cracks when flexed. The hose disappears behind the manifold heat shield and he suggested he splice in a new section, which I agreed to before I left.
When we were under the car removing the under tray we noticed the sump gasket was leaking slightly so I agreed that it'd be wise to drop the oil and renew the gasket while he had the car, it's done 4,000 miles in the year (almost) I've had it so I'd have been changing it soon anyway.
So, collected the car after work, all sorted, battery coded to the car (I fitted a new one a couple of weeks ago) and a bill for £240 (£100 for parts) so I'm somewhat relieved as I feared something more significant on Friday night.
She's back on the drive, washed and dried, and all is well again in my world
I hope yours is as easy a fix as mine Andy, fingers crossed for you mate