We do love a good Michael Portillo series and this time he's back on those train again. This time he's trying to retrace journeys featured in George Bradshaw's 1913 publication Continental Guide. He begins in Spain, where he visits the scene of an assassination attempt at a royal wedding in Madrid, before dancing with an unusual partner in Cordoba. He investigates the story behind Bizet's Carmen at a tobacco factory in Seville, learns about Winston Churchill's tense diplomatic mission to Algeciras and finishes with tales of British espionage in Gibraltar.