Knocking at front

[zippy500]

I have a slight knocking at the front when I go over bumps/dips. I was wondering if this is the suspension bushes. Other options could be something loose, anti roll bar etc. Can anyone confirm this if possible by my rubbish description. It seems to come more from the driver side. Its being serviced at Penninsula in 2 weeks so I may get whatever it is done also I havent had chance to look yet, I may have a gander tomorrow. Any thoughts. The car has done 17000 miles if that helps.