The project was approved by the Government on 14 December 2011 and vegetation clearance started during 2013. The project received final Government approval through an Order of the Transport and Works Act on 24 July 2013 and was signed off and formally given the green light by the government on 17 March 2015 when it was confirmed that Transport for London would be responsible. Work on the extension stopped in 2016 due to anticipated cost overruns and an unresolved dispute over funding.