“A painting by Italian master Canaletto is expected to fetch between £4-6m at auction in London. Bucintoro at the Molo on Ascension Day is part of a £15m auction of items owned by Portuguese businessman Antonio Champalimaud, who died last year. The painting shows the Doge’s barge, the Bucintoro, with crowds on what is thought to be Ascension Day, when the Doge blessed the city.”