Call to expand Crossrail's route (BBC News)
 

A group of railway managers asks for a planned rail route through London to be extended.

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it does make sense to at least make provision for expansion in the future....and a Stansted to Heathrow link sounds sensible, a chance to move the domestic flights out of LHR.

Basinstoke extension sounds interesting, how long though befroe someone suggests a Southampton extention? Maybe Reading would be far enough......