In December 2015, Transport for London reported on its assessment of the various options, and said that a route to Lewisham via the Old Kent Road, rather than via Camberwell, had the strongest case, and that this extension could be open by 2030.
I december 2015 afrapporterede Transport for London sin forundersøgelse af de forskellige muligheder og konkluderede, at en rute til Lewisham via Old Kent Road frem for via Camberwell var at foretrække, og at denne forlængelse kunne åbnes i 2030.