British American Tobacco on Thursday said it was taking a £27.3 billion (34.5billion)writedownonthevalueofitsU.S.cigarettebrands.Thecigarettemakerhadpreviouslysaiditwasgoingtotakeabigwrite−down,whichitestimatedinDecemberwouldbearound£25billion.AccordingtodatafromCalcbench,therehasn’tbeenawritedownthislargebyaU.S.−listedcompanysinceAOL’s35.6 billion write-off in 2014. BAT is writing down the value of Newport over 20 years, and Camel, Natural American Spiri ...