It has been a year since radioactive gas was found at the Cotswolds filming location for the BBC show, Wolf Hall, in Oxfordshire.
Last December, the National Trust applied for planning permission to remove dangerous radon gas from a Jacobean manor house used as a filming location for epic drama Wolf Hall.
The series follows the rise and fall of Henry VIII’s closest adviser, Thomas Cromwell, and is based on Booker Prize-winning novels Wolf Hall, Bring Up The Bodies and The Mirror And The Light by Dame Hilary Mantel.
Oscar winner Mark Rylance plays King Henry VIII's chief advisor, alongside Emmy award winner Damian Lewis as Henry VIII.
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Chastleton House, near Chipping Norton, stood in for the Seymour family seat, Wolf Hall, where Henry first falls for Jane Seymour in the hit BBC show.
The house was built by a rich wool merchant and owned by the same family for nearly 400 years, but in the early days of the 17th century, the family lost their wealth and could not update the house, which remained a ‘well-preserved Jacobean time capsule’.
Series producer Mark Pybus said: "The Seymours are on the up when we first meet them, before Jane becomes queen.
"It’s one of the only properties in the drama that has a shabby feel. We wanted to get across that they’re not as rich as other people in the show."
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Chastleton’s small stone courtyard also doubled for Putney, where Cromwell endured a miserable childhood and is seen being viciously attacked by his father.
The National Trust, which acquired Chastleton in 1991, applied to West Oxfordshire District Council last year for planning permission to remove radon gas from one of the buildings.
The application said that following an inspection, it was found that Ostlers Cottage "has above the recommended maximum level" of radon outlined by the World Health Organisation.
Radon is a natural radioactive gas which is believed to be linked to lung cancer.
The Trust engaged a radon consultant to look at options to reduce these levels and "protect the tenant of Ostler’s Cottage".
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The works were set to create a radon barrier in the void below the suspended floor in the living room, where it was believed that the radon was entering the building.
"The only visible evidence of this will be a tile vent in the outside wall," it said.
"Once this is complete, it will extract the radon to the outside air, removing it from the interior of the accommodation."
Following these remedial works, the area was set to be retested to document the levels and ensure they are reduced.
Both the National Trust and West Oxfordshire District Council have been approached for a fresh update on the situation.
