I jacked up the car & supported it and pulled the drivers side halfshaft. Nothing wrong there, so off to the passenger side. This is what I found.
Thankfully the break was at the hub end so removal of the rest of the shaft wasn't a problem. I found a serviceable hub & shaft, so I fitted that and did a brake clean up & service while I was in there.
Although it doesn't legally need an MOT now, I've got it booked in for one tomorrow so fingers crossed.