The Ferguson P99 may have won one F1 race, but the car and it's race effort were, indeed, obscure. It was raced several times in 1961, 62 and '63. It's only victory was at Oulton Park in a Gold Cup race–which was a non-championship event which generally conformed to F1 rules–and the only reason it won was the track was wet...the one situation where the obsolete and heavy, front-engine Ferguson P99 had an advantage. While it was driven by the likes of Sterling Moss and Graham Hill in some championship events, it never truly won an F1 race...if we consider "F1 races" those which are in the Formula One Championship.
I stand by my statement that the P99 was..."an obscure British Formula 1 race car."
As for Harry Ferguson inventing antilock brakes, my research could not confirm that. My research seems to indicate that Dunlop developed the first commercially successful anti-skid braking systems for aircraft. The Dunlop Maxaret system was first used on British military aircraft, such as the Handley-Page Victor and the English Electric Lightning. Maxaret was later adapted to road cars. I'm sorry but I could not find a connection between Harry Ferguson, Dunlop and the Maxaret development.