Britain faces a disruptive second election before Christmas if either of the two main parties tries to govern alone with a minority in parliament after tomorrow's ballot, Nick Clegg, the deputy prime minister and Liberal Democrat leader, warned yesterday. Two days before what is expected to be the UK's closest election since the 1970s, Prime Minister David Cameron's Conservatives and the opposition Labour Party were level in most polls.That raises the prospect of another coalition, something Britain has had since 2010, or of one of the two main parties trying to govern as a minority administration relying on smaller parties for support on a vote-by-vote basis.Clegg, whose centrist party has been in coalition with Cameron's Conservatives for the past five years, wants to form another coalition with whomever wins the most seats and votes tomorrow.He said a minority government would be "a shambles" because it would be vulnerable to the whims of smaller parties such as the Scottish National Party and the anti-EU UK Independence Party, which would make demands in return for their short-term support."If they try to stagger through with a messy, unstable minority government instead of putting the country first then they will risk all the hard work and sacrifices people have made over the past five years," said Clegg, referring to the Conservatives and Labour."The last thing Britain needs is a second election before Christmas. But that is exactly what will happen if [Labour leader] Ed Miliband and Cameron put their political interest ahead of the national interest."..