By Bethany Wales ITV has snapped up a majority stake in the TV production company behind smash hit shows including Sherlock, Men Behaving Badly and Amazon Prime’s The Devil’s Hour. The media company didn’t disclose how much it had paid for the stake in Hartswood Films, but said the investment was a “further milestone” in its international expansion strategy. ITV has added dozens of production companies to its group over the past couple of years, including Nicola Shindler’s Quay Street Productions, Happy Prince, led by Dominic Treadwell-Collins, Ben Stephenson’s Poison Pen Studios and natural h…