Analysis of information sources in references of the Wikipedia article "Crevichon" in English language version.
'The steps to St Paul's Cathedral are said to be made with granite from Crevichon, the little island to the north of Jethou.'
An even smaller Channel Island, Crevichon, to the north of Jethou, is said to have provided the granite for the steps of St Paul's Cathedral.[dead link]
'The steps to St Paul's Cathedral are said to be made with granite from Crevichon, the little island to the north of Jethou.'