Following the announcement that seven government departments have provisionally agreed to reduce their budgets by up to 10%, underground and business leaders are urging the Chancellor not cut funding for major tube projects.
They say schemes like the planned £250 million makeover of Holborn station are vital.
Holborn serves the 'midtown' business district but is closed several times during rush hour because it can't cope with its 100,000 passengers a day.
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The retrospective is so in-demand the museum will open its doors all through the night for the first time since it opened in 1857.