Jeremy Corbyn has urged voters to send a message to David Cameron by supporting Labour in the "Super Thursday" elections.
Ahead of the votes in contests across the country the party released a new poster with the slogan: "Elections are about taking sides. Labour is on yours."
Read more: Labour suspends three councillors over social media messages about Israel
In the latest party election broadcast, Mr Corbyn said: "This Thursday's elections are a chance to send a message to David Cameron and his Government. It has become increasingly clear they simply cannot be trusted.
"They certainly can't be trusted to make sure the richest pay their fair share of tax."
He added "they can't be trusted to protect the local services we rely on" and Mr Cameron and Chancellor George Osborne had "failed to meet any of their targets to fix the economy".
The elections will provide the first national test of Mr Corbyn's leadership as Labour critics insist the party must make gains, with former shadow cabinet minister Michael Dugher suggesting a benchmark of another 400 seats.
Read more: Kezia Dugdale admits Labour anti-Semitism row has damaged her election campaign
But with experts forecasting though the party could lose hundreds of seats in England - and apparently on course for another mauling in Scotland and a tough fight in Wales where devolved governments are up for election - Mr Corbyn insisted he will not place "arbitrary figures" on what would constitute success.
It was in the wake of the Chancellor's 2012 "omnishambles" budget that this set of council seats was last contested, with Labour taking advantage to make significant gains under Ed Miliband, adding more than 500 councillors.
That platform makes it hard for Mr Corbyn to emerge with an eye-catching result even if he should inspire a resurgence in support.
His strongest hope of a headline-grabbing victory lies with Sadiq Khan wresting back the London mayoralty after eight years of Tory Boris Johnson at City Hall.
But while the Labour candidate remains the bookies' favourite, the Tooting MP is engaged in a concerted effort to prevent his campaign being derailed by the anti-Semitism row and to distance himself from both Mr Corbyn and ex-mayor Ken Livingstone.
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