The outsourcer Mitie has agreed to a £3.1bn takeover by its private-equity owned rival OCS Group, ending nearly four decades on the stock market and making it the latest London-listed company to be acquired this year.On Tuesday, the government contractor said its board has recommended that shareholders accept a cash offer of 221.6p a share, a 44.7% premium to Monday’s closing price.Mitie, which was founded in 1987 and employs 84,000 staff, specialises in facilities management, such as engineering maintenance and other services such as hygiene and security.Its longstanding chief executive, Phil Bentley, announced last month that he would leave in...