Getting a knocking from the front somewhere, not sure what it could be,

its over big bumps sometimes and steering sometimes, but also when driving say 30mph and give it a quick sharp turn to the right, i get the knocking noise. so when driving along if i keep doing quick yanks of the steering wheel to the right, i get the noise each time i turn the car.

Any ideas what thos could be? driving me mad. Did try jacking up the drivers side front and yanking on the droplink but it seemed pretty solid

any ideas much appreciated