FILE - In this Wednesday, Dec. 9, 2020 file photo, UK Chief Brexit negotiator David Frost leaves 10 Downing Street, in London. Britain’s Brexit minister predicted Monday, May 17, 2021 that relations between the U.K. and the European Union would continue to be “bumpy,” amid tensions over post-Brexit trading arrangements. David Frost said talks with the EU on ironing out the problems were “not hugely productive” so far. (AP Photo/Matt Dunham, File)