Deep in the Welsh Valleys three families give up their 21st century creature comforts and time-travel back to face the hardships of life in 1927. As the families settle into the punishing routine of a 1927 mining community, the men face a tough training period to equip them for life at the coal-face, the children cope with school and discipline and the mams get to grips with mangles, ranges and the first tin bath.