Guardian: The Green party’s single MP will not enter into a formal Labour-Liberal Democrat coalition and would treat any Commons vote on a case-by-case basis, BusinessGreen.com has learnt. The newly elected MP for Brighton Pavilion, Caroline Lucas, was yesterday thrown into the political mix surrounding the competing Labour and Conservative talks to form a coalition government with the Lib Dems, when Prime Minister Gordon Brown said Labour would enter formal negotiations with the Lib …