I understand that there are UK CX customers stuck on holiday in countries other than their home one.
No one seems to have any idea what they should do.

Me, I'd drive home, but many wouldn't.

Driving home is an option but do realize that insurance is likely invalidated.

What have the dealers said when they've been contacted?

I'm not so sure.

If one were to contact the insurer and say "Help, I've been instructed not to drive the car and I need to get home" then they would pay for recovery, but if you were on holiday and not in contact with your dealer or MMC how would you know of the recall?

To invalidate the policy, the insurance company would have to somehow prove that you knew of the recall and were aware that you had been instructed (not just advised) not to drive the vehicle, and that you had been instructed on how to arrange for return of the vehicle in a safe manner.

Otherwise there would an entirely legitimate response of "I knew I had to return the car to my dealer and I was doing just that". If they were a dodgy cheapo insurer they might try to wiggle out of first-party costs, but they'd still honour third-party claims in the event of any accident.

I think some local recovery into secure storage (receipted..)

Hire car organised (receipted)

Holiday continues

Dealer gets car home at their expense

Owner claims for costs.

If insurances become involved, they pass issues on to claims administrators, who in turn add profit margins. Owner gets home, maybe even a hire car to the sea side.

But as that's out of MMC's control, they will argues costs & owner becomes embroiled, bitter and joins TM to vent anger..

The best idea is to admit you're screwed, leave to dealer instructions.

And open a cold beer.

The bottom line is that people who spend CX money will seek compensation.

Especially when stuck overseas or miles from a dealer.

If the Plus Six had been built with a manual box and spare wheel back in 2019, I may have ignored my own advice, and jumped straight in. I'm so pleased it wasn't, and I didn't!

Always good advice, just done that after an hour's tootle/blast through the New Forest. Beer is mainly to celebrate the miracle of the fuel gauge, which suddenly started working again. A case of Major Tom to Earth I suspect.

Re the various issues on the CX's:
(a) were the worst to happen while you thought you "might as well just drive home", and there was a major prang, if the insurance was invalid surely that it a disqualification issue ?
and
(b) to help me understand the international dimension, how many of the CX's are living in say Germany, France, USA, Australia...etc, where distances from the customer to the dealer might be a flight away, i.e. an awfully expensive trailer ride.

We thought long and hard too just recently about moving to a new Plus Four and were very tempted, but decided not to take the plunge. So glad our heads ruled our hearts particularly as we would have been down near the South coast when the news came through and we would have had the hassle of getting the car back home (as did one of our party on the same trip).

Just so we get some proper details rather than lots of supposition - what advice did the dealer/MMC give to them at the time (I assume they made contact to get instructions)?

I think the CX has only been available in the UK and Euro zone so far? There is a reasonable dealer network around Europe so not too far I would imagine.