Regarding the Coronation, they should be invited and welcomed with open arms...
...but it would be unfortunate if His Majesty's Customs and Excise drug sniffer dog signalled the pair so they had to be detained while their private plane, and everything on it, was forensically taken apart. They'd also need to wait for blood screening results and be subjected to full cavity body searches.
I would expect that investigation would take, at a rough guess, until the Coronation and attendant celebrations had ended.
That would be a shame
...but it would be unfortunate if His Majesty's Customs and Excise drug sniffer dog signalled the pair so they had to be detained while their private plane, and everything on it, was forensically taken apart. They'd also need to wait for blood screening results and be subjected to full cavity body searches.
I would expect that investigation would take, at a rough guess, until the Coronation and attendant celebrations had ended.
That would be a shame