LONDON (AFP) - British Prime Minister Gordon Brown fought for his political life on Thursday as the public voted in European and local elections that could push him closer to the brink. An email letter was being circulated around his Labour Partys lawmakers calling for him to quit, while a looming cabinet reshuffle could see senior ministers revolt if he demotes them. Speculation that Brown was preparing to step down sent the British pound crashing against the euro and dollar. Browns spokesman described the rumour as complete nonsense. to the prime minister, the email highlights Browns enormous contribution to this country and to the Labour Party, and this is very widely acknowledged. However, it added, in the current political situation, you can best serve the Labour Party and the country by stepping down as party leader and prime minister, and so allowing the party to choose a new leader to take us into the next general election. Brown is struggling to assert after four government ministers two cabinet members and two junior ministers quit in two days over an expenses scandal that has rocked the British parliament. Business Secretary Peter Mandelson urged colleagues not to sign the letter against Brown . British politics is in a bad old state, nobody is happy and its affecting all the parties, he told the BBC, admitting that lawmakers were in a grumbly mood. Dont please, through your actions, make it any worse for the Labour Party than for the other parties who have all got to come to grips with this crisis affecting British politics. In power since 1997, the Labour party has borne the brunt of public outrage at revelations of dodgy expenses claims made by lawmakers, a row made worse by the fact Britain is struggling to climb out of its worst recession in decades. Britains 72 seats in the European parliament were up for grabs in Thursdays elections, while voters in various parts of England were also choosing 2,318 local councillors and three mayors. Opinion polls suggest Labour could finish behind the main opposition Conservatives tipped to win the next general election, due by mid-2010 the Liberal Democrats, and even fringe eurosceptics the United Kingdom Independence Party (UKIP). Such a poor showing for Labour would pile further pressure on Brown , who has been repeatedly challenged by opposition parties to call a general election immediately. A spokesman for Browns Downing Street office said the prime minister was spending the day there working. The PM is focused on getting the job done on renewing trust in our political system and our democratic processes and taking the kind of decisions that will help the British people get through difficult economic circumstances, he said.