10. Baker Street / Edgware Road Signal Cabin

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Tim and Siddy explore the disused parts of Baker Street.

9. Greenwich / Notting Hill

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Siddy has arranged incredible access; they have special permission to explore Greenwich Power Station

8. Quainton Road / Kingsway

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The tables are turned and it's Tim who's the tour guide, showing Siddy around two Underground stations.

7. Elizabeth Line / Angel

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Tim and Siddy experience the breath-taking newest east-west railway, the Elizabeth Line.

6. King's Cross / Marlborough Rd.

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King's Cross St. Pancras is a stunning example of how the Underground network has adapted over time.

5. London Bridge / Ongar

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Tim and Siddy explore the hidden parts of London Bridge Underground station.

4. Brompton Road / St. Paul's

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Tim and Siddy embark on an incredible night-time adventure.

3. King William Street / Knightsbridge

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King William Street was the original terminus of the first deep level electric Tube in the world.

2. Waterloo & City / Mark Lane

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It's a weekend and the perfect opportunity for Tim and Siddy to explore the world of the Waterloo & City line.

1. Charing Cross / Kensington

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Siddy and Tim explore a Tube station in the heart of London: Charing Cross.

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