Emma Hignett's voice is heard on all the London buses, and she's employed for sounding clear and composed. But the woman behind that sound hasn't always been entirely sensible. In Episode 15, the voice of the London Overground speaks to the voice of the London Underground. They've both been paid to say Cockfosters, but only one of them might have done it in six inch heels and feathers... With Elinor Hamilton. Produced by Karl Svenson at Tadah Media.