The Shadow Secretary of State for Transport, Maria Eagle, says the Heathrow spur of the high speed rail network would cut down on domestic flights and improve the overall capacity of the airport.
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.
Sam Allardyce has quit as manager of Crystal Palace and retired from football management.
Authorities named Salman Abedi as the suspected attacker who detonated a bomb at the Manchester Arena.