This is a picture with several mysteries, the most obvious of which is how the car came to be in the water, either dumped there or perhaps by accident.
 
The lighter at right is Spitfire, about which I can find no information, but behind it and clearly in rather poor condition is the tug Doris White. This began life in 1930 as Prima, built for James Dredging, Towage & Transport Co Ltd in Southampton, who in 1936 sold it to the Admiralty for use as a dredging tug in Portsmouth. After being fitted with a new engine in the 1940s it was sold in 1955 to A. White (W.E. White & Sons (Towage) Ltd) of Erith, who renamed it Doris White (they had a fleet of tugs with names ending White.) But, according to the Thames Tugs website from which this information comes, in 1972 Doris White was sold to M J Batty and Associates, Singapore and shipped as deck cargo from Rotterdam to Singapore, later renamed and possibly sold to Persian owners in 1976 with her register closed in 1992. But clearly in 1982 Doris White was here on the Thames.