I had the same problem, had it tracked twice, wheels changed around, and ford even replaced my front left alloy but did not solve the problem!! Took it then to my local family run garage, they fixed it within 5mins running perfect now. Tuurns out my air pressures where all to pot.. More air in the drivers front tyre than needed and less than needed in the passenger side. Causing the left drift. Please check these out before paying any money out it might save you time and money.