It would have involved excavation under listed buildings, under a medieval fever and smallpox hospital and the gasworks, creating huge constructional and pollution problems.

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The alternative to St Pancras would have stretched under the main King's Cross building, the carriage entrance on its north-west side, and a gasworks to the north, he says.

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Opposite the museum is the KultuuriKatel (Culture Cauldron), where work is underway to transform the gasworks into Tallinn's own miniature version of London's Tate Modern gallery by 2015, combining art galleries, music studios and public spaces.

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