Rubbish and litter blocks the waterways of a canal in Stratford, east London. Algae and household pollution lies on the surface of the waters dug by navvies of the Victorian era when canals around Britain helped supply the industrial revolution with the raw ingredients to power the furnaces, mills and wharves of the transport age. This is a small outlet of the River Lea where the future Olympic Park would be built - the waters once again freed from 20th century dereliction.