A new model of Rolls-Royce that will go into production next year has made its debut on the back of a superyacht in Sydney Harbour.

The car, which is expected to cost more than ?250,000, is known as the Dawn and is a two-door, four-seater convertible ? or ?drophead? in Rolls-Royce parlance ? with a 6.6-litre V12 engine.

The more than 2.5-tonne supercar was filmed with Sydney Harbour and its iconic opera house and bridge in the background.