Daimler 2.5 V8 Vicarage Convertible.
Produced as a one-off by Jaguar specialist Vicarage (They also created convertible variants of the Jaguar MkII of which the Daimler 250 V8 was based on, this is the only Dailmer they have converted). This car's previous owners include the son of King Khalid of Saudi Arabia, and TV/Radio and ex-Top Gear presenter Chris Evans. It went up for auction at this year's Goodwood Festival of Speed.
More information here: https://www.bonhams.com/auctions/23593/lot/250/
Spotted in Knightsbridge, London, United Kingdom