Roughly following the line of the Greenwich Meridian from the Bow Back Rivers at Pudding Mill Lane, this East London walk traces the industrial heritage of the lower Lea Valley from fine porcelain in the 18th century, through gasworks, gin, cosmetics and explosives to film studios. As we go we follow part of The Line, London's first dedicated modern and contemporary art walk.   We finish at the now green oasis of Gasworks Dock with the chance for refreshments before a short walk to Star Lane DLR station.