Cleaners and porters due to protest today, their 20th day of strike action.
Another day of strike action is due to take place at Swindon's Great Western Hospital.
The GMB union says it is down to the long-running row with employer Carillion over claims of bullying and intimidation.
A company statement said:
"Carillion has now concluded its thorough investigation into the collective grievance at the Great Western Hospital, Swindon, and our focus now is to ensure that the detail of our findings and our proposed actions are communicated face to face with all of our staff. Our first duty is to give people the time and space they need to understand our findings and to ask any questions they may have.
"To achieve this, we are organising a series of team talk internal meetings for all of our 398 employees. These will take place over the week beginning Monday 11th June. We have issued staff with a short summary document to prepare them for these meetings.”
"We were dismayed to learn that the GMB has called yet another day of strike action on 11 June without waiting to see our findings and proposed actions. It is irresponsible to yet again cause disruption at the hospital when we are clearly addressing all our employees' concerns and there is no reason for any on-going dispute.. It also shows the GMB seem set on their own campaign regardless of the actions we take to resolve all the grievances raised."
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