Elizabeth Line: Tim Dunn and Siddy Holloway explore the brand new Elizabeth Line and have access to two of its stations weeks before the line opens. [S,AD]
Quainton Road and Kingsway: Tim and Siddy visit Quainton Road in Buckinghamshire, 50 miles from London - and once on the underground. Siddy also explores Kingsway tramway tunnel. [S,AD]
Greenwich Power Station: Tim Dunn and Siddy Holloway visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice. [S,AD]
North End: Tim Dunn and Siddy Holloway visit North End under Hampstead Heath. Abandoned before completion, the station became a Cold War bunker. [S,AD]
Holborn: Tim Dunn and Siddy Holloway explore the abandoned branch line between Holborn and Aldwych. And at Holloway Road they find out about the Tube's only spiral escalator. [S,AD]
King William Street, Knightsbridge: Tim Dunn and Siddy Holloway explore King William Street, the original terminus of the first electric Tube in the world. [S,AD]
Archway: Tim Dunn and Siddy Holloway explore hidden parts of Archway. Once called Highgate to encourage more people to travel there before an actual Highgate station existed. [S,AD]
Heathrow: Tim Dunn and Siddy Holloway head to the sprawling Heathrow Airport underground stations - the first ever underground rail link between an airport and a city. [S,AD]
West Ashfield & Oval: Tube fans would be right in thinking there are 272 Underground stations, but Siddy Holloway has such unique access, she is taking Tim Dunn to the 273rd - West Ashfield. [S,AD]
Green Park: Tim Dunn and Siddy Holloway are heading to a stunning station you won't find on modern-day tube maps - Dover Street, now known as Green Park. [S,AD]
South Kensington: Tim Dunn and Siddy Holloway begin their journey at South Kensington, home of Victoria and Albert Museum, the Science Museum and the Natural History Museum. [S,AD]
Greenwich Power Station: Tim Dunn and Siddy Holloway visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice. [S,AD]
Quainton Road and Kingsway: Tim and Siddy visit Quainton Road in Buckinghamshire, 50 miles from London - and once on the underground. Siddy also explores Kingsway tramway tunnel. [S,AD]
Elizabeth Line: Tim Dunn and Siddy Holloway explore the brand new Elizabeth Line and have access to two of its stations weeks before the line opens. [S,AD]
King William Street, Knightsbridge: Tim Dunn and Siddy Holloway explore King William Street, the original terminus of the first electric Tube in the world. [S,AD]
Euston: Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere and the bits set for demolition for HS2. [S,AD]
North End: Tim Dunn and Siddy Holloway visit North End under Hampstead Heath. Abandoned before completion, the station became a Cold War bunker. [S,AD]
Holborn: Tim Dunn and Siddy Holloway explore the abandoned branch line between Holborn and Aldwych. And at Holloway Road they find out about the Tube's only spiral escalator. [S,AD]
Greenwich Power Station: Tim Dunn and Siddy Holloway visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice. [S,AD]
Quainton Road and Kingsway: Tim and Siddy visit Quainton Road in Buckinghamshire, 50 miles from London - and once on the underground. Siddy also explores Kingsway tramway tunnel. [S,AD]
Elizabeth Line: Tim Dunn and Siddy Holloway explore the brand new Elizabeth Line and have access to two of its stations weeks before the line opens. [S,AD]
Holborn: Tim Dunn and Siddy Holloway explore the abandoned branch line between Holborn and Aldwych. And at Holloway Road they find out about the Tube's only spiral escalator. [S,AD]
Archway: Tim Dunn and Siddy Holloway explore hidden parts of Archway. Once called Highgate to encourage more people to travel there before an actual Highgate station existed. [AD]
Archway: Tim Dunn and Siddy Holloway explore hidden parts of Archway. Once called Highgate to encourage more people to travel there before an actual Highgate station existed. [AD]
Archway: Tim Dunn and Siddy Holloway explore hidden parts of Archway. Once called Highgate to encourage more people to travel there before an actual Highgate station existed. [AD]