This year's services and events are being attended by far fewer people because of the Covid outbreak.
Billionaire Ron Burkle reportedly buys the estate for a quarter of its initial asking price.
Many had wondered if he would mention the former king's scandals in his Christmas speech.
A further 800 personnel are to be sent to Kent on Christmas Day to help test drivers for Covid-19.
The country returns to stricter coronavirus restrictions on Christmas Eve until at least 12 January.
The 52-year-old doctor wrote in a post from her hospital bed that she had to "beg" for treatment.
Boris Johnson said the UK has "taken back control", while Ursula von der Leyen said it was time to "look to the future".
Food producers were already cushioned from the outcome of negotiations by a separate protocol on NI.
Analysis of how the Brexit trade deal will change relations between the UK and the EU for good
