Finally, it's here
My fascia kit arrived in the post yesterday and I installed it last night. Overall I'm very happy with the result - quick and neat, and it's a sturdy, well-made kit. I've attached a photo of the end result.
The kit includes 2 plastic brackets which go either side of the head unit to hold it in place, and the fascia itself which is just a big trim ring that clips into place. The brackets line up perfectly with the factory screw holes and the whole job took only 15 minutes - most of that time was just removing and re-installing the console. There is provision to mount either one large head unit or 2 stacked single DIN units.
Since it might be a month or two til they're available through the shops, I wondered if I should try to import a few more through my contact in the US. Anyone interested? Should be around $35-40...