The long-running public inquiry into safety and wellbeing issues at two Scottish hospitals is due to restart later.
The next 14 weeks will focus on water contamination and ventilation issues at the Queen Elizabeth University Hospital (QEUH) and Royal Hospital for Children in Glasgow.
Why is the inquiry being held and what is it covering?
The inquiry is being chaired by Lord Brodie KC and is examining issues at both the QEUH campus in Glasgow, and the Royal Hospital for Children and Young People (RHCYP) and Department of Clinical Neurosciences in Edinburgh.
The RHCYP in Edinburgh was due to open in July 2019 but was delayed after last-minute inspections found safety concerns over its ventilation systems.
The Scottish government then stepped in to prevent the hospital from opening just days before it was due to accept patients and there was then a 20-month delay until its full opening while improvements were made.
The £840m QEUH campus, which includes the Royal Hospital for Children, was hailed as a world leading facility when it opened in 2015.
But a series of infection outbreaks and concerns around the water and ventilation systems began to emerge three years later.
These have been linked in some cases to patient deaths, including that of 10-year-old Milly Main.
An independent review into the hospital’s design published its findings in June 2020.
The report found a “series of problems” with the design and build of the hospital, but no clear evidence to link those failures to any “avoidable deaths”.
However, that investigation did not consider child cancer patients.
What is the format of the inquiry?
The statutory public inquiry is being led by Lord Brodie, a High Court judge, and held under the Inquiries Act 2005.
This gives it the power to require witnesses to attend and to disclose information related to the inquiry’s work.
The independent inquiry describes its “overarching aim” as considering the “planning, design, construction, commissioning and, where appropriate, maintenance” of both the hospitals.
It will determine how ventilation and water contamination issues affected patient safety and care – and whether these issues could have been prevented.
The inquiry will also recommend how “past mistakes” in both projects can be avoided in future NHS projects.
Why did the Scottish government order the inquiry?
Former health secretary Jeane Freeman ordered the public inquiry in September, 2019 and in June the following year she set out its terms of reference.
Ms Freeman said it had been ordered to protect the “safety and well-being of all patients and their families” which she said should be a “primary consideration” in all NHS construction projects.
The announcement followed an intense period of scrutiny over the delays to the RHCYP in Edinburgh and a series of of infection outbreaks – and at least four deaths – at the QEUH.
A BBC Scotland investigation in June 2020 also spoke to senior doctors at the QEUH campus who said their attempts to raise concerns about risks to patient safety were not taken seriously.
They told BBC Scotland’s Disclosure they were branded as troublemakers for raising the alarm.
What evidence has the inquiry heard so far?
Who will we hear from in the latest phase of the inquiry?
The third phase of public hearings on the Glasgow hospitals begins later and is scheduled to run until 15 November 2024.
It will hear from five groups of witnesses including infection control clinicians, contractors involved in the construction of the hospitals and NHS Greater Glasgow and Clyde estates staff.
A panel of independent experts commissioned by the inquiry will also be called to assess the findings of key reports.
This includes a review of the cases of 84 children who developed infections while undergoing treatment at the hospital.
All of these witnesses will allow the inquiry to examine the extent that non-compliance with relevant regulations and guidance led to ventilation and water contamination issues at the Glasgow hospital.
They will also consider if this led to patients being put at additional risk of exposure to potentially deadly infections.
One aspect that will not be considered at the latest hearings is a new report commissioned by NHS Greater Glasgow and Clyde which claims the site had no excess infections since 2015.
The inquiry ruled the health board had not presented the 218-page report to all parties in enough time before the hearings begin.
Further hearings relating to the Glasgow hospitals are expected next year.
What have some of the affected families said?
Among those who have followed the Scottish Hospitals Inquiry closely since 2019 is Prof John Cuddihy whose daughter Molly contracted an infection while undergoing cancer treatment at the Glasgow hospitals.
He said: “I think when you consider the length of time that it is taking, and accepting that it is a very complex inquiry, four years is hard length of time for anybody.
“And particularly when patients continue to be treated and they continue to endure the trauma that they had gone through in 2018 all of that is ever present in their mind.
“So four years on, it is a challenge to keep motivated, to keep enthused… and I think within this we forget this is a human problem.”
Another consideration for some of the affected Glasgow families is an ongoing corporate homicide investigation into the deaths of four patients at the hospital campus.
The Crown Office and Procurator Fiscal Service is probing the deaths of Milly Main, two other children and 73-year-old Gail Armstrong.