Would a Victoria line extension into South London along with the

London Underground Victoria Line, RailTransportinLondon Wiki

A Look At The Future Of London's Transport

A Brief History of the Northern Line - Londontopia

Kent Route Study (Part 3): Victoria Metro Services - London Reconnections

Victoria Line closure Q&A: Which stations will be closed? How long will the line be affected? What alternative routes are there?, The Independent

The 5 London Underground line extensions that are most likely to happen - MyLondon

London Underground Major Regeneration Scheme - Railway Technology

London Underground Major Regeneration Scheme - Railway Technology

New Improved South London Tube Concept- what additions/ changes would you make? (Sorry about the mess around tooting) : r/LondonUnderground

Victoria line - Wikipedia