MPs and peers have urged ministers to think again about a controversial new strikes law, warning the legislation would likely put the UK in breach of the European human rights rules.

A new report by the Joint Committee on Human Rights, made up of peers and MPs, warns Rishi Sunak’s government that the Strikes (Minimum Service Levels) Bill is likely to be incompatible with the European Convention on Human Rights (ECHR).

The proposals, which moved rapidly through the Commons and are now in the House of Lords, aim to ensure there are minimum working standards during strike days across six sectors, including health and transport.

The plans have been attacked by trade unions, while Labour have promised to repeal the law if they win power.

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The proposed legislation does not set out what the minimum service levels should be, but hands ministers the power to impose minimums through secondary legislation.

In the new report, MPs and peers raise concerns the plan would clash with requirements under Article 11 of the ECHR, which guarantees freedom of association for workers.

The committee, whose report comes as the bill is debated again in the Lords on March 9, has called on the Government to reconsider the legislation.

In a 45-page consideration of requirements under European human rights law, parliamentarians warn that “without the Government providing specific evidence establishing a pressing social need for minimum service requirements in respect of each of the very broad categories of service set out in the bill, compliance with the requirements of Article 11 ECHR remains unclear”.

As well as offering alternative proposals, the committee said the penalties that would be imposed on trade unions for failing to comply with the bill would be “severe”.

It said: “In our view, they may amount to a disproportionate interference with Article 11, particularly in circumstances where the strike does not involve essential services and risks to life and limb.

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“The Government should reconsider whether less severe measures, such as loss of pay or suspension from work for employees who fail to comply with work notices, could be effective.”

Committee chair and SNP MP Joanna Cherry said the bill needs amending to address some of the “deep flaws”.

She added: “Heavy-handed sanctions are compounded by vague rules that would leave striking workers and unions in confusion as to whether they had been met or not.

“The sectors included in the bill are also ill-defined, risking over-reach into areas only tangentially linked to the maintenance of vital public services. This means the bill, in our view, is likely to be incompatible with human rights law which provides a right to association and with it, protection for strike action.”

She called on the UK Government to “think again and come back with legislation that better respects the protections guaranteed by the European Convention on Human Rights”.

Labour's deputy leader Angela Rayner said the committee is “just the latest expert body to conclude the Government’s shoddy bill is not just unworkable but likely unlawful”.

She added: “It’s time for ministers to go back to the drawing board, not plough on with a dog’s dinner of a policy that will do nothing to resolve disputes and instead risks pouring petrol on the fire.”

A UK Government spokesperson said: “The purpose of this legislation is to protect the lives and livelihoods of the public and ensure they can continue to access vital public services.

“We note this report and will consider it in full, but the Government needs to maintain a reasonable balance between the ability of workers to strike and the rights of the public, who work hard and expect essential services to be there when they need them.”