All episodes for series 4 of Secrets of the London Underground

S4 E1 · Earls Court

Tim Dunn and Siddy Holloway explore Earl's Court station.

S4 E2 · Paddington

Tim Dunn and Siddy Holloway explore Paddington station.

S4 E3 · Waterloo

Tim Dunn and Siddy Holloway explore Waterloo station.

S4 E4 · South Kentish Town

Tim Dunn and Siddy Holloway explore the disused station at South Kentish Town.

S4 E5 · Thames Tunnel

Tim Dunn and Siddy Holloway explore the very first tunnel under the Thames.

S4 E6 · Ruislip Depot

Tim Dunn and Siddy Holloway explore the maintenance depot at the end of the Central Line.

S4 E7 · Northumberland Park

Tim Dunn and Siddy Holloway explore the maintenance depot at Northumberland Park.

S4 E8 · Stockwell

Tim Dunn and Siddy Holloway explore Stockwell station on the Victoria Line.

S4 E9 · Gloucester Road

Tim Dunn and Siddy Holloway meet at Gloucester Road in London's museum quarter.

S4 E10 · Old Street

Tim Dunn and Siddy Holloway explore the unusual station at Old Street.