Help Please knock on front end and can't find out what it is

Oliver122

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Hi guys , i was wondering if any of you have come across this problem before . I believe i have a knock on my front off side corner which i cannot bottom , it only seems to knock on a rough road , if i go over a speed bump it doesnt knock . I have changed the drop links ( the bushes were turning in the ends) which did not resolve it , ive changed the lower ball joint ( that had up and down play ) that hasn't resolved it either and ive also changed the top mounts on somebody's advise and still that hasn't resolved it . when i changed the top mounts i could not feel any play in the upper arm ball joints , and i have never checked the rear lower arm ball joint .Before i go down the route of changing the arms out (£50 each for the upper, 4 of and £120 each for the lower arms 2 of ) i was wondering if anybody has had this issue and how they fixed it .

cheers
 
Is it happening when the car body rolls? May be sway bar bushes?