The Government is expected to announce plans to sell its 40% stake in the cross-channel Eurostar as part of a target to raise £20 billion through the privatisation of financial and corporate assets by 2020.
Danny Alexander, the chief secretary to the treasury, will announce the Eurostar sale as part of a wider £375 billion investment programme to 2030 and beyond, called the new national infrastructure plan (NIP).
Last month Eurostar revealed it had seen an increase in revenues and passenger numbers compared with last summer.
Sales revenue for the period July-September 2013 reached £207 million - a 10% increase on the same period last year - and passenger numbers in summer 2013 rose 5% to 2.7 million.
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The Office for National Statistics said gross domestic product grew by just 0.1%.
William's comments came during a surprise appearance at an event scheduled for just his brother.
Matt Campbell, who collapsed just a few miles from the finish line, had hoped to raise £2,500.