A majority of 85 per cent of GMB Members at Forfarmers voted to take strike action after the company failed to make an offer that would see them put on an equal footing with their colleagues at sites in England.
GMB members took strike action on Monday 3 of July and are looking at future dates unless the company fails to make a fair offer that negates the shortfall.
Workers providing the same role as their counterparts in England are paid up to 30 per cent more by the company.
Peter Hill, GMB Organiser, said:
"It can’t be right that our members in Wales undertaking exactly the same job are paid significantly less than their counterparts across regions in England.
“That is unfair, plain and simple.
“The company needs to come back to the table and negotiate with the GMB urgently and get a deal."
