In my simple mind, the message here is that, with Brexit, Britain will go from Great to Little. I do think the car is not necessary, but it was there, one of those things.
Yes, nothing I could do about the VW, but it adds scale and depth.
At a stretch, and after the fact, you might think of it as Germany watching, silently, as a certain domestic mindset walks away from its best business opportunity in search of Empire loyalties that it long ago betrayed. The festive pantomimes of royal visits to far-flung lands are just a nice day out for the locals, and I'm sure the ones not on the official invitation list must wonder what else that expenditure could have been used to finance instead...
(I really do feel sorry for the royals having to do this stuff. Well educated and of wide experiences, they must find all sorts of problems with what they are obliged to perform. More than anyone, I am sure they realise this is not the time of Queen Victoria. For the expectant wife, it must be one mother of an initiation into something she probably had little understanding of, or preparation. Or, is it just another film set?)
There is certainly irony in the name of the place itself, but I have no doubt that the owners had quite another meaning in mind at the time.