what would cause this? Citroen relay van

On my old work horse van there is something wrong with the steering/suspension.



The steering doesn't self centre correctly.



It pulls in the direction that I just turned.

So I turn left out of the road and when I straighten up the van pulls to the left until I reach a right turn. After I've taken the right turn it pulls to the right once on the straight.

It does seem to go away after a while when on national speed straightish roads.



Anyone know what I should check first?



Cheers

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