backwards and forwards without inspection after breaks and republic of ireland would remain in the european union while northern ireland as part of the u.k. would have to exit britain may have to reintroduce a so-called hard border with customs checks for goods people and services and that's a huge worry for northern ireland's dairy farmers who depend on easy cross border trade. milk is northern ireland's most important agricultural product but uncertainty over what will happen when britain leaves the european union has left many farmers on edge especially those who currently trade with and travel freely to the republic of ireland which is staying in the e.u. because of the way the whole system set up there will be tariffs there traded on the european quality standards at the minute or standards when chains will be as high as ever they are but does at present barriers for creating this product in the future and the fact that we don't know is the difficult part in addition