Ford Fiesta Mk4 pulling hard to left

Hi
I have just driven my girlfriends car and it seems to be pulling really hard to the left hand side, even at low speed.
its a ford fiesta mk 4 1.25 zetec with no power steering
you can drive it in a straight line but you can feel it pulling quite strongly. turning right is a big effort whereas turning left is really easy
I have checked tyre pressures, and the car can be pushed with hand brake off so it dosent seem to be brake sticking. I thought it may be the universal steering joint but i thought that if that got seized it would be hard to turn the car in either direction
does anybody have any ideas please as to what is causing it
thanks
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check the tires by switching the front ones left to right/right to left. Drive it and see if it pulls the other way. If it does pull the other way it is a tire....If not its alignment.
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