LONDON Britain's economy stagnated in July, official data showed on Sept. 12, dealing another blow to the Labour government at the end of a turbulent week for Prime Minister Keir Starmer . Gross domestic product flattened in the month following output of 0.4 percent in June, the Office for National Statistics said in a statement. The government has suffered two high-profile departures in the past week, firstly Starmer's deputy Angela Rayner who resigned for underpaying a property tax. The PM on