From poking around online it looks like the UK is alone among the G20 by not having a dedicated long(?)-range VIP transport for Head of State and associated nobs.
That should be embarrassing....you already took their "yacht" and, I believe, train, for gawds sake!
Of course you're all ruled by the red tops and "Mr Angry from Purley" so am grabbing popcorn for the inevitable beating of the breast. I guess if the saintly Lady Di still walked among us the same folks would happily offer up a taxpayer funded pink Concorde for her...liaisons.
Shame. Used to be a nice country.