The East India Dock Company followed and by 1810, there were also three on the south bank. Investment came predominantly from the capital’s wealthy mercantile and shipping communities, with slave trade interests strongly represented in both the West India and London companies. Wartime conditions failed to affect investment or impede the capital’s remarkable dock boom. The design for the downriver West and East India systems presented few problems, unlike the constricted setting of the London Docks. Labour shortages, bad weather and material scarcity affected construction by generally experienced contractors, but all docks were operating by 1806. The final costs exceeded estimates but only in the case of the London Docks by a large margin. Clearing housing and industries in Wapping burdened it with long-term debt. All the north bank companies chose a hierarchical employment structure. In contrast to strict supervision in the West India Docks, London replicated the traditional system on the quays, allowing its managers considerable autonomy. In their new regulated workplace, labourers faced restrictions, discipline and the loss of traditional perks.