So today I may have done something that cause or helped this issue reveal its self, but gave me great joy in doing so. I had a 40 tonne wagon at work carting woodchip get stuck on the edge of the grass on full lock, no chance of going back as it would have split hydraulic hoses etc. Modern trucks. I was told, apparently have a cut off, when the wheels start spinning, it cuts the engine for safety, which is why it couldn’t get off the grass. So, I have tow straps in the back and think, easy, low range, slow pull and should free it up. Brilliant, all worked out great, few spectators saying that’s “impressive for a Range Rover” etc, was a great day. Anyway following my walk around from the site and heading back to the office and absolutely no drive when I get back in to do my journey. I tried all setting, and managed to get it moving, albeit feeling like I had a clutch that had about as much grip as the skin on rice pudding... but something at least when I had low range selected, I manged to get it turned around and back to the workshop (500m away). Looking underneath and noticed the driveshaft had come out from the front diff on the drivers side. Stealing a members photo called "Rom” below looks exactly like what I was dealing with.

It occurred when you changed the air strut, its quite common to happen.

Update:

So, tried getting the driveshaft back seated and didn't have a chance without the removal of the hub.

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That looks as though the shaft hasn’t been fully fully home, otherwise it would have sheared much further down the shaft/ spline or possibly not sheared at all.

I think its all related to my front strut change. I think I had accidentally unseated it when doing the swap and then as you said, has been unseated, all power right on the end and has just failed where the recess has been cut for the clip.

I had mine pop out after not installing it properly following a strut change. No damage however! I thought it was going to be difficult to do but it turned out to be quite simple.
There's an installation tool, a collar type thing, the use of which isn't explained in the manual. I decided I needed something to be able to apply pressure on the shaft so that the snap ring compressed and engaged properly. A 42mm ( I think) exhaust clamp on the driveshaft did the job. Inserted shaft, pushed on exhaust clamp with a longish length of quite heavy steel angle, compressing the slide in the cv joint and springiness of the boot, then gave the angle a few good whacks. There was a sudden and very noticeable release when the driveshaft went home! I did it solo, but it would have been a doddle with someone to operate the lump hammer!

Chris