Boris Johnson is expected to visit the Crossrail site at Tottenham court road later.
The mayor will be questioned on yesterday's government spending review.
A commitment of £2 million was made to look into the north-south rail link for cross rail 2 in yesterday's spending report by George Osborne.
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Gary Johnson says he signed a "gagging order" as part of his settlement - but Chelsea have since waived the clause.
Rail passengers hit by long-running disruption on the Southern network are to be repaid the equivalent of a month's travel.
The studios were home to some of ITV's best loved programmes dating back to the 1960s.