In post-referendum Scotland, the SNP are polling around 40 per cent, which could hand them more than a dozen Labour seats.
Today's numbers rely on nearly one in three young voters backing the Greens - we need more data before we can confirm today's spike.
The pollsters and the media have to make decisions based on public opinion – but those decisions can then shape us.
Marginal polls cost money.
Labour are only convincingly ahead in four of the ten seats in today's Ashcroft polls, but they need to win all for a majority in May 2015.
Ed Miliband’s party could start election night with nearly 260 seats, before it even starts winning those it lost in 2010.
Four of the six most recent polls have handed the Tories a lead, and an average of all suggests we are tied.
The latest polling by Lord Ashcroft offers a snapshot of the wipe out facing Lib Dems in battleground seats against Labour.
Lord Ashcroft poll shows that 56 per cent of voters would like to see a Labour-led government after the next election.
A fall in support for the Lib Dems will propel Labour to victory in Tory marginals.
What lies behind Labour's 10-point poll lead?
The Tories surge past Labour in the polls after Cameron's rejection of a new EU treaty.
Lib Dems fall to seven per cent in new poll, just two points ahead of Ukip.
Labour lead up to eight points as Tory support falls to just 33 per cent in new Populus poll.
Latest YouGov poll puts the Tories on 39 per cent, just a point behind Labour.
New ICM poll puts the party on 18 per cent, their highest rating since September.
Latest opinion poll puts Labour on 42 per cent with the Tories trailing on 37 per cent.
Support for Clegg’s party falls to just 8 per cent – the lowest level in 20 years.
Latest opinion polls puts Labour two points ahead of the Conservatives.
Ed Miliband's party opens up a two-point lead in the latest ComRes poll.
Tories behind in new Populus poll for the first time since November 2007.
Support for party plummets to lowest level in 13 years.
Support for Labour rises four points to 40 per cent in the wake of the student fees announcement.
Poll shows 83 per cent support child benefit decision - Labour must be clearer in its defence of the
A major psychological boost for Ed Miliband.
Party's poor poll ratings trouble activists on eve of annual conference.
Labour draws level with the Conservatives for the first time since October 2007.
73 per cent of voters no longer know what the party stands for, latest poll finds.
Liberal Democrats fall to 12 per cent in new YouGov poll, their lowest rating since 2007.