I have Googled these questions myself but have just got more confused. 1. Which Irving Berlin musical featured a dream of a white Christmas? 2. What European head of state wears a crown but is not a monarch? 3. Why is Parliament sometimes referred to as "St Stephens"? 4. What was the fate of the Stone of Destiny at Christmas 1950.?
"Holiday Inn" contains the song "White Christmas".
I think the answer to 4 is that it was stolen.
Isn't St. Stephen's Chapel part of the Houses of Parliament?