Cheers, Mate!
Just bookmarked it. That's a bit cheaper than the ones I have been looking at.
I was trying to avoid beavertails, and hadn't really thought about a towing dolly, don't know if that would be a good idea for a nearly 600 mile trip. but thinking about it, I don't really know why not! You can tell I have only rarely towed a car before, on a trailer except for the short distance to an MOT station to get a kit car registered. And that belonged to a mate, single axle and again a Metro on another mates trailer from Weymouth to my place. so far more experience towing the box trailer, which at the end of the day is more difficult both to load and to tow.
We have also thought about one of those long distance A-frame things, but they have now got to be connected to the brakes and vacuum supplied to the system. Even though it doesn't need it. Won't go into detail now but this ought, basically, to be an easy thing to do, connecting into the towed cars braking system mechanically but some idiot decided it had to be able to use the servo, despite the fact that system supplies easily enough pressure to the pedal even without the servo. and there is the business of making holes in the bodywork or through the grille etc. Can't see us having time to do this now.
I'll deffo look into using a dolly, it might actooly be the answer.
Thanks again mate for making me think out of the box!!