UK business warns May post-Brexit frictionless trade more important than tariffs - source

British business leaders warned Prime Minister Theresa May during a meeting on Monday that maintaining frictionless trade with the European Union after Brexit was probably more important than the imposition of any tariffs, a source told Reuters.May and several top ministers met business chiefs including the bosses of pharmaceuticals giant GlaxoSmithKline, supermarket Tesco, carmaker Aston Martin, telecoms firm BT and construction company Balfour Beatty to discuss Brexit.May has ruled out Britain