From now on I will make note of my ''sources'' before I post something. I don't remember where I heard about the lunch, but here's a post I found. I couldn't read the whole article, you have to register for it. The emergency meeting was for 2pm.
The article appeared at the telegraph.co.uk 7 days ago. Title = Staff banished, and a calming lunch (Link won't take)
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7 days ago - Staff had been told to prepare the Long Library, used to house a bowling alley and where, as children, Princes
William and
Harry would take tea while staying at the
Queen's Norfolk estate. ... It is thought the
Queen, the Prince of Wales and the Duke of Sussex had
lunch together before Prince
William arrived at 1.45pm.
https://www.telegraph.co.uk/royal-family/2020/01/13/sandringham-summit-happened/