Presenter Michael Portillo visited the Clyde last week, travelling from Greenock to Helensburgh via the Waverley.
The former Defence Secretary was spotted at Helensburgh Central station, filming for the programme which is expected to be screen on BBC in January.
Stewart Noble, chairman of Helensburgh Heritage Trust, had met Mr Portillo at Port Glasgow where he was interviewed in front of the replica of the Comet, the world’s first passenger steamship, and its designer Henry Bell, who was also the first Provost of Helensburgh.
“After he finished interviewing me I travelled on with him and his film crew to Greenock, where we boarded the Waverley on the short journey across to Helensburgh,” said Mr Noble.
“It was then their intention to do more filming at the Henry Bell monument and at Queen’s Court in East Clyde Street which was formerly Henry Bell’s Baths Inn.”