One of the first groups to be invited was the Covent Garden Festival, a local arts group that has been one of the development's most vocal critics.

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Say has been a vocal critic of the Islamic-rooted Justice and Development Party, which has governed Turkey since it first won parliamentary elections more than a decade ago.

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The review concludes: "There is a strong feeling amongst commissioners that it is now time to become more vocal, to strengthen the critique of poorly designed and mediocre development and to draw attention to persistent failure to adhere to national sustainability policy".

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In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

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