The TUC has called for an independent supermarket regulator to be created to ensure fair play for suppliers.

At the Congress in Brighton, the GMB highlighted Northern Foods' Trafford Park plant, which is to close with the loss of 700 jobs.

A motion to stop the closure was carried by the TUC, which called on its general council to make a submission to the Competition Commission, using the closure as an example of the shift in bargaining power.

"Multiples are abusing their purchasing power, leading to job losses as employers resign from unprofitable supply contracts," said the TUC.