Workers at high street chain Wilko are to stage a walk-out in a war over "brutal" working hours.
More than 1,500 employees will take action over a proposed new rota system that will see two major warehouses run seven-day operations.
Staff at two of the firm's distribution centres - Magor in Wales and Worksop in Nottinghamshire - have voted in favour of strike action, a move the GMB Union has claimed will cripple deliveries across the UK.
The dispute is over plans by Wilko, headquartered in Worksop, to "standardise" seven-day working at the centres. This differs from previous arrangements where weekend work was in response to demand.
A date for the strike is yet to be confirmed, but Nicola Savage, GMB organiser, said: "More than 84% of votes were cast for strike action. It's clear how angry workers are about this brutal new rota system.
“Wilko prides itself on being a family run company – but they’re imposing contracts that will force staff to work on the weekends, splitting up family time, without the agreement of their employees.
Are you a worried Wilko worker? Get in touch: emma.munbodh@mirror.co.uk
“It’s clear now that those values don’t extend outside the Wilkinson family.
“We’ve tried to negotiate with management again and again – but they don’t want to know. Our members feel backed into a corner, and strike action is the only option left open to them.”
A consultative ballot on the issue was held in May in which 90% voted in favour of taking action.
An official ballot began last month.
Wilko, based in Worksop, reported a £34.8 million profit in the last financial year.
A Wilko spokesman said: "We share our team members frustrations and we remain committed to working with them and their representatives to further reduce the number of weekends they need to work, so that they can spend as much time as possible with their families.
“We hear the feedback from the ballot and are keen to resolve any differences as quickly as possible as we don’t believe strike action is in anyone’s best interest at this challenging time for both retail in general and the High Street.
“The reality is that our customers expect to shop with us seven days a week and we must respond to meet our customers’ needs. The requirement for more regular weekend working in logistics continues and we are only asking team members to work within their existing contracts.
“There are robust plans in place to ensure customers can continue to shop with us if any action occurs.”
