FF ( Ferguson Formula) Developments Limited (FFD) was a British company founded by Major A.P.R. (Tony) Rolt to exploit 4WD technology, Rolt had worked as Technical Director at Harry Ferguson Research for many years.
The Peter Whitehead/Ian Stewart and Tony Rolt/Duncan Hamilton cars blew head gaskets, and the Stirling Moss/Peter Walker car, the only one not overheating having had a full-sized radiator hurriedly fitted, lost oil pressure after a mechanical breakage.
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Fred Dixon and Tony Rolt had gotten together to consider the possibility of using 4WD in circuit racing, and with Harry Ferguson keen to promote the transmission systems of his Ferguson tractor firm work began on the P99 in 1960.