Imagine if you could harness the power of the 34,000 commuters who pass through London's Victoria station in peak rush hour. These people could be generating 102kWh of power - that's enough energy to provide the power for 25 households for that day. To discuss how to convert this untapped energy source Quentin Cooper is joined by Claire Price, director of an architecture practice that has spent the last six months aiming to bring the technology out of the lab and onto the streets. Producer Colin Grant