Brexit and coronavirus have slashed the volume of surface freight leaving Britain for the European Union by 68 percent from last January, according to figures published in The Observer on Sunday.The stark drop in goods carried on ferries and through the Channel tunnel was registered by lobby group the Road Haulage Association (RHA) after a survey of its international members, said the weekly.RHA chief executive Richard Burnett has sent a letter to minister Michael Gove warning that the new checks required since Britain fully left the EU's single market on January 1 were deterring exporters from shipping to the continent.He said the government had only hired around 20 percent of the extra border staff needed to process the extra.