According to the photo of his hand-written menu in Einstein's Watch, by Fenwick and Husselby, on his last flight to the United States as Prime Minister of England in 1954, Winston Churchill, then age 79. ordered his breakfast on two trays.
Coffee & milk
Jug cold milk
Small piece cold chicken or meat
Glass orange squash (ice)
There is no record of whether he wore the glen check suit in the photo.