Tuberculosis can shut a farmer down "for many years" and "it really effects their business", a farming union told Daybreak.
Chairman of the National Farming Union, James Small gave a detailed description of what a farm could go through if one case of bovine TB is found, which he dubbed "really heartbreaking".
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Through the day, most of the cloud should break up to leave fine conditions for many with spells of sunshine.
The Eiffel Tower in Paris was plunged into darkness, with the Burj Khalifa in Dubia emblazoned with the Union Jack.
The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.