New HS2 boss Sir David Higgins says his argument to win support is "what's the alternative?".
Higgins: "Transport is the centre to all forms of regeneration... In the south it's about capacity, in the north reconnectivity."
Higgins adds that HS2 will fail if it's a political football and believes it can be cheaper if it's built quicker.
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Transport secretary Chris Grayling said MPs will decide this week about where to allow airport expansion in south east England
The Met Police has thanked residents in Northolt for their patience but has warned the armed stand-off could take time to resolve.
A man said to be armed with dangerous articles remains inside an address in west London.