Plot: London’s transport systems are iconic and ingrained on the Londoner’s psyche, not just as an essential part of life but part of the capital’s identity – and it’s London on the move that inspires Rachel’s cooking this time. She’s the guest at an unusual supper club where the food served up in a tube carriage, and she rolls her sleeves up to make sausage and mash for some hungry taxi drivers in one of London’s historic cab shelters