Steering Problems

Hi Guys just wondered if anyone had any ideas as to the problem i'm having with my car, I've noticed recently that when I turn hard left out of my driveway that my car feels like it's drifting across the road . I have paid almost £1000 to have brand new tyres fitted to new refurbed alloys about three months ago and whilst this work was done had it taken a specialist garage and had a super tracking done on the wheel alignment so everything was top drawer. .Now however having taken it in to Ford under warranty they checked it out and amit something is wrong but don't know what so I now have to take at cost to myself to a garage with equipment to do a full steering geomatry check. Any ideas guys..