BusinessAviva calls for fixed plan on BrexitOptimism: Aviva boss Mark Wilson shrugged off claims Brexit will hurt the CityAFP/Getty ImagesClare Hutchison9 September 2016The boss of insurance giant Aviva has called on the government to provide a clear timetable for Britain’s exit from the European Union.Britain is yet to trigger so-called Article 50, which would begin the process of untangling the nation from the trading bloc. This is despite calls from European council president Donald Tusk to do so as soon as possible.Mark Wilson said the investment market wanted “certainty of timeframe”.“We need to take some time, take a deep breath, we need to sort out what the plan is,” he told Bloomberg TV.Wilson also cast doubt on claims that the City will be hurt by Britain’s departure from the EU.“It is still a financial hub. Trying to unwind all of that is a pretty tall order and I don’t think that will happen.Read MoreGordon Ramsay: I’ve never seen it so bad for restaurants as it is nowWH Smith hire turnaround veteran with package that could be worth £25mBlue Posts boss: If opening a pub becomes so risky, people just won't do itSponsoredIncredible days out and trips for autumn and winter“The reality is that London is home for insurance, so for us it doesn’t make much difference. “In the EU there is not one single insurance market. It’s no easier for me to do business in France than Singapore or China.” Aviva has forecast profit growth in the mid-single digits for the next few years.MORE ABOUTAvivaInsuranceBrexitThe City