Employees have walked out for four hours a day every Friday since 6 May, until last Friday (18 June) when they added an extra hour.

The union has threatened that action could become more severe if the company does not respond to requests to discuss a pay increase and improved working conditions, after staff took a 13% pay cut two years ago.

Unite also started an appeal on behalf of the Wyndeham Impact employees, requesting donations to the strike fund.

Unite national officer Steve Sibbald said: "The appeal is to acquire funds to support the workers' losses. It has gained a lot of publicity within Unite and the union movement.

"From the company's point of view it looks like they are living with it, hoping it fizzles out, but if anything the resolve of the employees is getting ever stronger."