I was waiting for this one too, but logged on too late as usual.
I first saw this car in 1998, at a classic car show near Reading in the UK. It looked newly restored, but what stuck in my mind was a hand-written notice on the front of it which made the extravagant claims that this was the only one of this model ever built, and that it had been made for the King of Belgium in 1950. I didn't say anything, though I did wonder why a European monarch would have wanted a right-hand-drive version, or indeed would have wanted a Standard Vanguard of any description.....
But when I read up about the political situation in Belgium in 1950, this claim seemed even less likely. The Wikipedia page on King Leopold III of Belgium gives a flavour. If he had been buying a car in 1950, then something bulletproof might have been more appropriate.
I'm not even sure about the date, as according to the DVLA database this car was registered in the UK in July 1952. But then that source is not 100% reliable, and I don't know any details of this car's early history. I'm slightly ashamed to admit that it has crossed my mind that this car could be a fake. I hope not.
Anyway, here are the photos I took in 1998 (on film! Remember that stuff?), with an enlargement of the notice, which is just about legible.