British elections are approaching: The most uncertain in history, the "North Korean" campaign

The British election campaign was very boring, and many media called it "North Korean" due to the parties' inability to show differences.

Uncertainty is rife over the outcome of the May 7 parliamentary election, which is likely to force incumbent Prime Minister David Cameron and his rival Ed Miliband to form alliances to rule the country, analysts say.

Pre-election polls show outgoing Conservative Prime Minister David Cameron and Labor opposition leader Ed Miliband each have the support of one-third of voters.

A dozen small parties share the remaining third, and hope to become the party that decides the future government.

Starting with the Liberal Democrats who have been in a coalition government with the Conservatives since 2010 and who can move to the left, through the Scottish nationalists SNP who are doing well in their autonomous area.

"This is the most uncertain election ever, as voters can remember," said Philip Cowley of the University of Nottingham.

The only certainty (97 percent according to the London School of Economics-LSE) is that neither of the two big traditional parties will be able to rule alone, because they will not have an absolute majority in the 650-seat Parliament.

If the result is as close as the polls have been indicating for six months, both Cameron and Miliband could declare victory on May 8, after the election.

Political headquarters are already preparing for heated trading that could last days or weeks, but not months like in Belgium, said Tony Travers of the LSE.

The worst scenario would be repeated elections due to an institutional blockade, according to Agence France-Presse.

The leading assumption is that the Conservatives will win in terms of the number of MPs, but that the victory will be taken away from them by Labor who will be in second place.

"The electoral calculus is not favorable to the conservatives," said Peter Kellner, president of the YouGov Institute.

Labor can envision a minority government backed by an alliance of anti-Tory parties, including the Liberal Democrats, the SNP, the Greens, and the nationalist Welsh party Plaid Camry.

The Conservatives can only count on the Liberal Democrats and the small Northern Irish parties.

The entire math is complicated by a voting system that can lead to large deviations.

For example, the Eurosceptic party Ukip, which was a big winner in the European elections in 2014, is predicted to get a maximum of four seats in parliament with 14 percent of the vote, while the Scottish nationalist party SNP, with four percent of the vote, can get about 50 seats.

The pre-election debates were dominated by the economy, taxes, health, immigration and Europe, and a Conservative victory would pave the way for holding a referendum on keeping Great Britain in the European Union, which Cameron has promised to organize by 2017.

The Conservatives and Labor are committed to reducing the budget deficit, but differ on how quickly and how to achieve this goal.

Some media, annoyed by the parties' inability to show differences, talk about a "North Korean-style campaign".

"The overwhelming feeling is one of boredom," with a series of photo shoots, flash visits and an avalanche of slogans at election rallies, said Kate Jenkins of the LSE.

A professor of history at the University of Nottingham says political leaders should still be motivated as the four fight for survival.

Liberal Democrat leader Nick Clegg and Ukip leader Nigel Farage will quit the leadership if defeated in their constituencies.

Ed Miliband and David Cameron could also lose their seats in the event of a defeat or even a narrow victory.