Fine Gael's support has fallen back to levels last year when Ireland was still in the bailout, according to a new opinion poll.

The news is no better for Labour and Fianna Fáil who also see drops, with Sinn Féin and others gaining.

The Sunday Independent/Millward Brown poll was carried out for nine days until yesterday - right throughout the controversy over how garda whistleblowers were handled.

Fine Gael, which is gathered in Dublin this evening for an Ard Fheis, has seen its party's support drops 3 points to 27%.

Coalition partners Labour don't fare any better - down four points to 8%.

Fianna Fáil doesn't capitalise and the party drops 5 points to 21%.

And that puts them behind Sinn Féin who go up 6 to 22% - their highest level of support since the general election.

Greens and others also go up 6 to 21 percent.