The Royal College of Nursing (RCN) has welcomed the news that the South West pay consortium has finished its work.
The final report from the South West Pay Terms and Conditions Consortium recommends that trusts work to implement national pay rather than regional pay.
Somerset Partnership NHS Foundation Trust was among the 20 that joined the pay consortium and committed an initial £10,000 to it.
Three health trusts have issued statements to their staff confirming that their involvement in the consortium's work has concluded and they will not be involved with it in the future.
Jeannett Martin, regional director of RCN South West, said: "The campaign by the RCN and other unions has been successful in diverting the South West pay cartel from their original intention to implement local pay systems across the South West region.
"The RCN calls for all employers in the South West who had been a member of the pay cartel to follow the lead of these three trusts and confirm to their staff that they will not return to a local pay cartel if it re-emerges in future. This will be a first step in rebuilding staff trust. Regional pay systems are not only unfair for staff, they are costly and complicated to implement and this wasted money damages patient care."