Union leaders will this week go to war with Sir Keir Starmer on wages, winter fuel payments and workers’ rights.

As the first TUC conference under a Labour government for 15 years opens in Brighton, the prime minister faces a massive list of demands.

Ahead of the conference, the TUC is claiming workers were “cheated” out of £2bn of holiday pay last year under the Conservatives.

“The Conservative government sat back and let bad employers cheat their staff out of their basic workplace rights,” said general secretary Paul Nowak.

“Tory ministers were more concerned about stopping people getting what they were due by introducing anti-union measures, than funding enforcement bodies properly.”

The unions’ latest demands come after inflation-busting pay deals for train drivers and doctors which senior Tories claim were payback time for bankrolling the Labour Party.

Sir Keir is due to address the conference on Tuesday and Angela Rayner, the deputy prime minister, will speak at the traditional TUC general council dinner on Monday evening.

On holiday pay, the TUC claims more than a million workers – one in 25 – did not get any of the 28 days paid holiday or equivalent they were entitled to last year, adding up to £2bn in lost holiday pay at an average £1,800 per employee.

Low-paid workers were said to be most at risk and the jobs with the highest numbers of staff losing out were waiters and waitresses (59,000), care workers and home carers (55,000), and kitchen and catering assistants (50,000).

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The TUC also claims millions of workers are missing out on other employment rights due to a lack of enforcement and that 365,000 workers – more than one in five – are underpaid the minimum wage.

Unions are launching a five-point plan for stronger enforcement of employment rights, including fines, more inspectors and inspections, extending licensing and a crackdown on exploitation of migrant workers.

Despite the bumper pay deals for train drivers and doctors to end their strikes, Mr Nowak is also demanding “pay restoration” for public sector workers, a big increase in capital gains tax and a wealth tax.

Delegates in Brighton will also debate demands on Sir Keir and Chancellor Rachel Reeves to restore winter fuel payments for all pensioners. Some 10 million are set to lose payments of up to £300.

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Ahead of a Commons vote on Tuesday, a motion in Brighton proposed by the giant Unite union, the shopworkers’ union USDAW and the public sector union PCS is expected to be backed by the conference.

Unite general secretary Sharon Graham said this weekend: “Why are Labour picking the pockets on the winter fuel payments instead of making those with the broadest shoulders actually pay.”

And in today’s Sunday People newspaper she calls on the chancellor to tax the rich to fund winter fuel payments, with a wealth tax to pay for a benefit U-turn.

Unions will also demand reassurances that Ms Rayner’s promised workers’ rights legislation, due next month, will not be slimmed down in response to pressure from employers.

Sir Keir has committed himself to introducing the legislation within 100 days of taking office and unions have already warned the government there will be outrage if that timetable slips.