Tim puts on his very best moquette socks and accepts a generous invite into the heart of City Hall, to chat with Deputy Mayor of London for Transport Seb Dance about a couple of big questions, including:

How much has cycling and air quality changed in London since the year 2000 when TfL was born?

The answer is: quite a lot, actually.

From riding a Santander hire bike through Canary Whard to jumping on the DLR and the Overground and beyond, Tim is on a mission in this series finale to uncover the secrets of TfL's environmental improvements and active travel: zero emission buses , ULEZ, energy efficiently in TfL buildings and so so much more.

Tim also takes a quick stroll over to the magnificent London Transport Museum to meet some young people who perhaps represent the future of London and won a competition to have their own voices on TfL public announcements: The TfL Superfans!

And finally - Tim ends his epic journey on board a beautiful London Tram, another jewel in the TfL crown.

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Mind the Gap is the Official podcast of Tfl, created by TfL

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A special thanks to the TfL25 corporate sponsors of this special edition podcast, they are:

 A.J Wells, Alstom, Arriva, First Bus, Go Ahead London, Keolis Amey Docklands, Links Signs, Metroline, Siemens, Stagecoach, Stewart Signs and Transport UK