Millions of people could be banned from mixing indoors and outdoors and thousands of pubs forced to close under new coronavirus restrictions due to be announced on Monday.Prime Minister Boris Johnson is set to outline a new three-tiered "traffic light" system of restrictions with measures expected to force pubs and restaurants shut across the north of England.Reports suggest under the top tier no household mixing will be allowed either, which could affect millions of people living in areas with high Covid-19 rates across England.Leaders across Northern England criticised the plans, accusing the Government of treating the region as "second-class" and did not rule out possible legal action.But the Sunday Times reported ministers were drawing.