Hubert Gregg，Hubert Robert Harry Gregg MBE (19 July 1914 – 29 March 2004) was a British broadcaster at the BBC, writer and stage and film actor. born in Islington, London, and attended St Dunstan's College and the Webber Douglas School of Singing and Dramatic Art. Gregg worked as an announcer for the BBC Empire Service in 1934 and 1935,while intermittently performing in repertory theatre.He wrote and acted in his first play, the comedy French Without Tears, which was performed on Broadway from 28 September 1937 to January 1938. In the Second World War, he first served as a private with the Lincolnshire Regiment in 1939, before becoming an officer in the 60th Rifles the following year.Gregg spoke German fluently, and worked for the BBC German service, to such good effect that Goebbels assumed he must be a German traitor.He was invalided out in 1943.Among his "more than 200 songs" he wrote was the wartime hit "I'm Going To Get Lit Up When The Lights Go up in London", written in 1940 and sung by his first wife, Zoe Gail, in George Black's 1943 production Strike a New Note.It was broadcast in 1944 to alert the Resistance that the invasion of Europe was imminent. On seeing German V1s flying over London, Gregg composed his best-known song, "Maybe It's Because I'm A Londoner," in 20 minutes while on leave in 1944;it became a hit and London folk anthem in 1947. He also composed numbers for the musicals The Love Racket (1943), Sweet And Low (1944) and Strike It Again (1945). After the war, he directed Agatha Christie stage plays, including The Hollow (1951) and The Mousetrap (for seven years, beginning in 1953).The period was the subject of his 1980 memoir, Agatha Christie and All That Mousetrap.He called Christie "a mean old bitch". He presented and performed in numerous radio programmes, including A Square Deal for seven years and Thanks for the Memory for over 30.He also acted in films and on television and wrote light comedies and two novels.