The Royal High School at Regent Road. Picture: TSPL

A scaled-down version of the proposal for the A-listed building at Calton Hill was unveiled last week. But Adam Wilkinson, director of Edinburgh World Heritage, said: “The revised hotel proposals for the old Royal High School continue to be inappropriate for this world-class building.

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“The bedroom wings are too large for the setting of one of the three finest Greek Revival buildings in the world, compromising views of the building and the romantic idea of the countryside in the city intended in its siting and construction.

“We’d be surprised if the development team can make the economics of this scheme work, having previously claimed that the economics of the previous proposal were on a knife edge.