Transport for London commissioner Sir Peter Hendy has said that a southern extension of the Bakerloo line could be completed within the next 15 years - a decade earlier than City Hall predicated last summer.

Hendy told a TfL board meeting: "Work is under way to update key elements of the costs, refresh the business case, and investigate a number of alternative route options suggested via the consultation. Subject to feasibility, funding and powers, an extension could be delivered by 2030."