Six celebrities travel back in time to the relentless graft of Victorian Britain, spending four days in four different 19th-century workplaces. Their first 24 hours lands them in the filth and grime of the city dump - the dustyard. Here, they must sift through mountains of dirt, rotting vegetables and old bones. With thousands of people flooding into cities to find work in the new factories, there is a whole lot of horse manure and human effluent to clean up.