British Brexit minister David Frost made an impassioned plea to the European Union on Tuesday to allow for "significant change" to post-Brexit rules governing trade with Northern Ireland, saying only that could draw the poison from their relations. A day before the EU is expected to present its proposals to solve a standoff over part of the Brexit divorce deal, Frost again warned Brussels London could unilaterally waive some of the terms of its agreement if the bloc failed to budge.