Workers at Tata Steel have started industrial action short of a strike as efforts continue to try to resolve a row over pensions.
Members of four trade unions launched a work-to-rule and overtime ban at sites across the country and are planning a 24-hour strike next Monday.
Talks at the conciliation service Acas have been adjourned but dialogue is continuing. Sources said a new offer had been tabled, but neither side would confirm or give any details.
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The unions are protesting over plans to close the final salary pension scheme.
Tata says it has to take action to stem a £2 billion shortfall in the scheme.