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
4. Being Human
Being Human UK: 2008-2013, 37 episodes
Being Human US: 2011-present, 39 episodes
5. Strictly Come Dancing / Dancing With the Stars
Strictly Come Dancing: 2004-present, 185 episodes
Dancing With the Stars: 2005-present, 308 episodes
6. The Thick Of It / Veep
The Thick of It: 2005-2012, 34 episodes
Veep: 2012-present, 18 episodes
7. The Office
The Office UK: 2001-2003, 15 episodes
The Office US: 2005-2013, 201 episodes
8. Pop Idol / American Idol
Pop Idol: 2001-2003, 46 episodes
American Idol: 2002-present, 475 episodes
9. Cash Cab
Cash Cab UK: 2005-2006, 30 episodes
Cash Cab US: 2005-2012, 240 episodes
10. The Chase
The Chase UK: 2009-present, 428 episodes
The Chase US: 2013-present, 8 episodes