The 1949 extension to Camberwell proposal was resurrected in 2006 when the then London Mayor, Ken Livingstone, suggested that an extension was being considered within 20 years.
Forslaget om forlængelse til Camberwell fra 1949 var genopstanden i 2006, da den daværende Londonborgmester, Ken Livingstone, foreslog at en forlængelse blev anset indenfor 20 år.