notoriously difficult to diagnose ... yours will probably be the ball joint if the bushes are OK ... trying braking while still powering along at low speed, if the noise goes it's deffo the dreaded B A N A N A B A R BALL JOINT
+1 Mechanics checked all suspension and used bars with full weight on one end and nothing was moving to warrant the noise, Banana Arms replaced as per recommendations from other owners on the forum, and guess what problem resolved....
Did change the Drop Links when purchased my new Eibach Arbs from Torqen.
Try Drop Links first as cheaper for you, if no cure then as ATTAK Z mentioned Banana Arms I'm afraid