2002 Citroen C3 Noise when going over speedbumps/uneven roa

For the last month, my car makes a noise (almost like metal hitting metal) on the drivers side near/around the front wheel when I negotiate speedbumps or if I travel along a bumpy road. On a flat road or motorway I don't hear anything.

I have looked under the car and there doesn't appear to be anything loose. A friend of mine reckoned it was the balljoint (?).

Any suggestions on the likely problem and its seriousness would be greatly appreciated.