I've just had my Focus TDCi fully checked and aligned at Drury Lane Auto Services in Oldham, Greater Manchster and have to say that the car now feels so much better.
After having my wishbone bushes replaced in November I had the tracking done at Kwik Fit, ATS and Ford but the car never felt quite right. Now it feels better than ever.
Paul at Drury Lane has the Hunter DSP 600 kit which is one of the best out there, they provide a before and after reading of the setup and then make the adjustments if you give the go ahead. A normal front track costs around £30 these days but I must say the full geometry check is more worthwhile as it checks every angle on the vehicle.
If in doubt speak to Paul at Drury Lane and he'll look after you. I'll always have a full geo check done now and never bother with the tracking again, its a waste of time and money.