1. Britain’s Got Talent / America’s Got Talent
Britain’s Got Talent: 2007-present, 87 episodes
America’s Got Talent: 2006-present, 193 episodes
Though the British version was cast and produced first, the American version beat it to airwaves after issues with the pilot.
2. Man About The House / Three’s Company
Man About The House: 1973-1976, 40 episodes
Three’s Company: 1977-1984, 172 episodes
3. Doctor Who
UK produced: 798 episodes
US produced: 1 TV movie — the 1996 movie Doctor Who was intended as a backdoor pilot to an American Who, but low US ratings meant no series emerged.
5. Strictly Come Dancing / Dancing With the Stars
Strictly Come Dancing: 2004-present, 185 episodes
Dancing With the Stars: 2005-present, 308 episodes
8. Pop Idol / American Idol
Pop Idol: 2001-2003, 46 episodes
American Idol: 2002-present, 475 episodes