Fiona and the team head to Leicester's Museum of Technology, housed in a Victorian sewage pumping station. The Abbey Pumping Station, complete with four working beam engines, provides a unique backdrop for the show. On a busy day of valuations, Mark Hill casts his expert eye over an abandoned sculpture which looks strangely familiar, could it be a lost masterpiece? Richard Price values a clock powered by gravity and John Axford explains how a tiny frog can have a big price tag.