Jack, Thompson is considered a good and reliable source, though he loved publicity. He wrote four books about guarding Churchill. His Sixty Minutes with Winston Churchill (1953) was signed so often on book tours that we booksellers used to refer to “the rare unsigned variant.”

Thompson also wrote Guard from the Yard (1938; re Churchill and others) and I was Churchill’s Shadow (1951). You can find them on Amazon and Bookfinder.com. Unfortunately Guard from the Yard is rare and expensive. Churchill’s quip about being “guarded and shadowed day and night,” in my post above is from that book.

Thompson references are plentiful throughout my website. See particularly my notes on his TV mini-series and his amusing remembrances of being a car passenger with the boss driving (a consummation devoutly to be avoided). Just type “Walter Thompson” into the “search” box and you’ll find other references.