Mystery Clunk sound
 

Hi, I have a 2011 MC Diesel Mondeo which has developed a clunking sound coming from the frontal area of the car? I have recently replaced the control arms, sway bay links and engine mounts but have absolutely no idea whats causing this sound or where its coming from.
It doesn't appear to be brought on by bumps or steering. You can clearly feel at low speed and is sporadic. If anyone can point me in the right direction I would greatly appreciate it. Thanks.