BBC One brings the story of the British high street to life in an ambitious new series that transports four empty shops and a group of modern shopkeepers and their families back to the high street's heyday in the 1870s, before propelling them through a century of dizzying change, right up to the Seventies. In the picturesque market square in Shepton Mallet, Somerset, the families' lives are turned upside down as they experience how shopkeepers lived and worked in six key eras of British history. But these are no museums. The shops will be serving modern-day customers who are used to the pace and convenience of 21st-century shopping. In tonight's opening episode, the shopkeepers are going back to the 1870s and the birth of the British high street, where they set up shop for the very first time. The butcher, the baker, the grocer and the ironmonger must all get to grips with every aspect of Victorian life. Masterchef judge Gregg Wallace is on hand to keep a watchful eye on the shopkeepers, making sure that they stick to the rules, regulations and technology of the day.