The latest opinion polls continue to show Labour enjoying a comfortable lead over the Conservatives.

Three surveys out on Monday reveal that Tony Blair's party is between nine and four points ahead as the campaign enters its final full week.

The news will come as a disappointment to the Conservative Party, which needs to be gaining more ground on Labour if it is to make large inroads into its parliamentary majority.

YouGov

A YouGov study for the Telegraph shows a fall in support for the Conservatives.

The Tories are down one point to 33 per cent, while Labour is unchanged on 37 per cent.

And the Liberal Democrats are up two per cent to stand at 24 per cent.

If these results were repeated on May 5, there would be a swing from Labour to the Tories since the last election of three per cent.

This would be enough to gain the Conservatives 20 seats but not nearly enough to prevent Labour from returning to power with a 100-seat majority.

Populus

The latest Populus tracker poll for the Times has Labour up one point to 41 per cent, with the Tories down one on 32 per cent. The Lib Dems are unchanged on 20 per cent.

This survey suggests that 62 per cent agree the Blair-Brown combination is Labour’s strongest asset. This includes 86 per cent of Labour supporters.

The poll also finds that voters are increasingly likely to cast their ballots.

Some 79 per cent of Tory supporters say that they are certain to vote, up 10 points over the past four days, while 67 per cent of Labour voters say they are certain to vote - up eight points.

Without these differences, Labour’s lead would be two points higher.

ICM

An ICM poll in the Mirror gives Labour a six-point lead.

Tony Blair's party is on 39 per cent, the Tories on 33 per cent, and the Lib Dems on 20 points.

The survey also found that 76 per cent of voters believe that the NHS offers a good service or better.

Seventeen per cent said the health service was very good, rising to 38 per cent of pensioners.