In December 2018 you said, “the end of December 2020 target is under review…. TfL is reviewing the timetable for the extension. This process is expected to be completed in the new year”. Are you able to confirm what the revised opening date is?
The review I referred to in my December 2018 oral update has been completed. The remaining works on the Northern line Extension are expected to be completed in autumn 2021, with a target opening date of September 2021. The opening of the extension continues to align with the wider regeneration of the Vauxhall Nine Elms Battersea area and will ensure Transport for London will be operating Northern line services on the extension when demand for the line is there.