There has been a substantial increase in support for Fianna Fáil since the Budget, according to the latest opinion poll.

The Red C poll in tomorrow's Sunday Business Post shows the party's support up four points, while both Fine Gael and Sinn Féin have lost two points since the last Red C poll two months ago.

Support for Fianna Fáil is at 27%. Fine Gael, at 34%, remains well ahead of its main rival, although the gap has narrowed significantly.

Support for Labour is unchanged at 17% and the Greens are also unchanged at 5% while Sinn Féin are now at 8%

Independents and others are unchanged at 9%.

Support for the government parties usually rises over Christmas when the Dáil is not sitting.

The next Red C poll in a month's time will give a better indication of whether the increase in Fianna Fáil support is a once off, or the start of a trend.