Overview: Tim Fox embarks on an epic biomass delivery, starting in Cumbria, going on to Northumberland and ending at a power station in Scotland. A mechanical fault develops on the walking-floor trailer, however, which threatens to bring the whole delivery to a halt. On the hunt for new trucks, Head of Fleet David Cox flies out to the Volvo factory in Sweden to size up the next generation of tractor units. Claims that these new models can cut emissions by up to 80% are an appealing proposition and David hopes to be able to increase the fuel efficiency of the fleet.