Tfl have started a formal public consultation on the above proposal

http://www.tfl.gov.uk/corporate/medi...tre/19950.aspx

I suppose it will mean a permanent separation of the Charing Cross and
City branches of the Northern Line at Kennington, and might ultimately
mean the splitting of the Northern Line into two separate lines (eg.
Edgware to Morden via Bank and Battersea to High Barnet via Charing
Cross) similarly to what was done when the Hammersmith and City Line
was created.

Any suggestions for a name for the new line?