The Opposition Leader crashed the vehicle, which belonged to his late mother, into two parked cars in Carlton on Sunday, an opposition spokesman confirmed.

There was minor damage to the parked cars and no injuries reported. The accident reportedly happened after the Labor leader spilled a cup of coffee.

But he could be forced to fend off more rumours of a different kind of spill, with a Fairfax Ipsos poll yielding his lowest approval rating as leader, and suggesting widespread support for increasing the GST if the poor are compensated and other taxes tweaked.

Prime Minister Malcolm Turnbull has taken an “everything on the table” approach to tax reform in recent weeks.

The poll, published today, shows a higher GST is backed by just 28 per cent of voters.

However, that figure jumps to more than half when lower income tax rates and changes to stop exploitation of superannuation tax breaks by the wealthy are suggested.

Pollster Jessica Elgood told Fairfax that 52 per cent of people would support the change if compensation was offered for households on less than $100,000 and other tax cuts implemented.

Meanwhile, the Coalition has jumped ahead of Labor in two party preferred terms 56 per cent to 44 per cent.

On the primary vote, the Coalition sits on 48 per cent, Labor 29 per cent, the Greens 13 per cent and others eight per cent.

But it is Turnbull’s preferred PM rating which has sky-rocketed, with 69 per cent support compared to just 18 per cent for Shorten.

Elgood said it’s “the lowest approval rating Bill Shorten has ever received since becoming leader of the Opposition and matches the low figures Tony Abbott achieved in January 2015 before the first leadership spill motion”.