Picture this - you are dug into the trenches in France during WW1, and suddenly a red double decker with a Tetley's tea advert trundles past. OK, we are being dramatic, but a large number of Transport for London's buses and drivers were shipped over to the continent during WW1. What happened to them? Did they come home?! And what happened in London in the absence of all these essential parts of London's infrastructure? Who will step into this role? Fiona takes on the mantle this week talking all about this little discussed part of the war effort.

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