New developments in battery technology are changing the way we power Britain. More efficient, higher capacity batteries expand the range of electric vehicles and allow solar and wind power plants to provide smooth, 24 hour electricity. Tom Heap is in Cornwall where power companies and local innovators are developing a new battery-powered economic model that could be rolled out to the rest of the UK. From mining the lithium that makes the batteries to holiday parks producing clean power for the grid Cornwall is leading the way. Producer: Alasdair Cross Photo: Nicholas Davies.