From The Four Corners (1942)
Director:
Anthony Havelock-Allan (as Anthony Havelock-Allen)Writers:
Leslie Howard, A.G. MacdonaldStars:
J. Johnston, W. Atkinson, R. GilbertThree soldiers, a Canadian, an Australian, and a New Zealander, are on leave in London where they meet an English film actor, Mr. Howard, who buys them a pint, takes them to the top of St. Paul's Cathedral, and demonstrates to them that they all have common roots in the Motherland and to ask them why they've crossed the seas to fight Hitler.
Here is the link to the film at the Internet Movie database: http://www.imdb.com/title/tt0033636/?ref_=fn_al_tt_1