Britain's trade negotiator has warned that his government will not accept EU supervision of its economy in exchange for close trade ties.<br />'' <br />'' Senior diplomat Mark Frost told academics in Brussels that London intends to set its own laws following Brexit and not follow EU-imposed "level playing field" rules. <br />''<br />''Frost's speech at the Free University of Brussels took place as EU member states are drawing up a mandate for their own negotiator, Michel Barnier.<br />''