Curious about what Winston Churchill's bodyguard carried, I came across this American Handgunner article by Mas Ayoob on Sir Winston Churchill. A good read 

"...Winston Churchill owned a substantial collection of fine guns, including magnificent bespoke shotguns from the finest English makers, and loved to hunt. No one knew his proclivities in firearms better than his long-time bodyguard, Scotland Yard Inspector Walter Henry Thompson. "Churchill offered to pay me five pounds a week as his bodyguard in a purely private capacity. He gave me his Colt automatic to use — and I may say with pride that I am the only man Mr. Churchill has allowed to handle his guns. He is a first-class shot and takes a jealous pride in his personal armory."...
"...Just what did Thompson mean by "first-class shot"? "We set up an outdoor range at Chequers and to this he would frequently repair and fire a hundred rounds or so with his Mannlicher rifle, 50 rounds from his Colt .45, or an equal number from his .32 Webley Scott. He gets well onto the target with all three, but with the Colt Automatic he is absolutely deadly … A gun is something he understands entirely."...
"...Just what did Thompson mean by "first-class shot"? "We set up an outdoor range at Chequers and to this he would frequently repair and fire a hundred rounds or so with his Mannlicher rifle, 50 rounds from his Colt .45, or an equal number from his .32 Webley Scott. He gets well onto the target with all three, but with the Colt Automatic he is absolutely deadly … A gun is something he understands entirely."...