This afternoon some toerag in a little white van decided that he wanted the piece of road I was occupying & didn't want to wait for me to move out the way - result - he drove into the side of me

(side on not T-Boned fortunately)
Anyway, the bike is rideable BUT, to steer in a straight line I need to angle the bars slightly - even I know that this ain't right !!
Can anyone give me any ideas as to what may be wrong ?
Obviously I'm gonna need to get the bike looked at professionally - but since the w****r didn't stop (I did get his number & have reported it to the police along with a witnesses tel number - but I'm not gonna hold my breath waiting for a result) - I would like an idea of how much I may be needing to pay out to get it fixed.