After the success of the Lotus 79 (and even the Brabham BT46B "Fan Car") in 1978 it was hardly suprising that other teams would also build "ground effect" cars. The most successful of these was the Williams FW07, which won 15 Grands Prix in its lifetime.
Whilst Team Lotus had first harnessed the power of "ground effect" their later attempts to get even more downforce with cars like the Lotus 80 failed. Williams on the other had had understood the limits of "ground effect" and produced agruably the most successful car of this type. After a very good year in 1979, the Williams FW07 powered Alan Jones to win the World Championship in 1980 and with Carlos Reutemann and Jones as runners-up in the 1981 championship.
TGP F1, Donington Park, May 2004
TGP F1, Donington Park, August 2003
TGP F1, Brands Hatch, August 2002