Cleaners at Swindon Great Western Hospital to strike again
Another strike is being planned at Swindon's Great Western Hospital, the GMB union has announced.
A total of 150 cleaners and domestic staff are expected to walk out on 16 May.
The row - with their employer, Carillion - is over leave and claims of bullying.
Workers have already taken 18 days of strike action and further action had been called off while Carillion investigated the matters.
The GMB submitted a formal complaint by 109 members of staff over allegations of managerial bullying in December.
The union said in March that it would temporarily halt strike action so Carillion could interview staff as part of its investigation.
In April, Carillion announced the interim results of its investigation and admitted there were shortfalls "in the expected standards of behaviour".
The firm said it was still investigating other serious issues.
A GMB union spokeswoman said it was "shameful" no action had yet been taken by Carillion following their interim findings.
She said: "Now they've said they're not going to communicate any results to us until the end of June. That will be six months it's taken them to carry this out."
A Carillion spokesman said: "We are on record as saying we hoped to conclude our collective grievance investigation and announce findings to staff by the end of May, provided there were no extra stoppages, prior to reporting back on all individual grievances by the end of June.
"The latest strike action threatens to derail our planned timescale.
"We are continuing to investigate thoroughly the grievances raised and are launching parallel moves to improve training and employee engagement across the site."
He said contingency plans were in place to safeguard the normal functioning of the hospital during any strike action.