The car was drivable but I had to really tug at the wheel to move it. The main problem seemed to be a very strong self-centring force: the wheels didn't want to point anywhere except straight ahead. This differs from what I understand is the normal problem with failed PAS: that it takes a lot of effort to turn the steering wheel (because you are working against the pressure of the PAS fluid) but that the wheels will then stay in whatever position you move them to, rather than trying to straighten.
It was disconcerting, but not insurmountable. I was able to change into Lane
1 on the motorway, where I slowed down to about 50 in case of any other symptoms later, and with a bit of effort held the car on the curve of the roundabout after I came off at the junction.Given that it took the garage about a hour of labour (that's what they charged me for) under conditions of good lighting and being able to work under the car in a pit if needed, I wasn't too disappointed that the RAC couldn't do it in the rain at 11 PM on a petrol station forecourt.
I had about 15 miles to get home. I *might* have been able to drive all the way, and not needed the RAC, but I wasn't confident that the battery would last with no alternator to charge it, and I didn't want to break down anywhere that I couldn't stop safely and without power for hazard lights.
Ironically, the RAC van had a problem just as we were pulling into my village, He'd lifted the front wheels of my car onto a pull-out two-wheel trailer" that extended from the back of the van. Suddenly we felt the van lurch. It turned out that one of the wheels on this trailer had just suffered a blow-out - fortunately at only about 30 mph. So he had to unload my car, change the wheel and reload my car - on an unlit bendy country lane. That's what those bright flashing yellow lights are used for. One bozo came round a bend a bit fast and nearly clipped the van, the driver said. I saw him approach but I was beyond the bend with a spare high-vis jacket on, holding the driver's temporary illuminated "hazard" sign as advance warning. Sod's law: the blow-out happened just after a bend, rather than on a nice straight bit of road with good visibility.