On idle I appear to have a strange click / rattle sound from drivers side engine bay.

Its not internal knocking i.e bottom end as its consistent through the rev range, sounds like a click more than a knock.

Ive removed the manifold heat shield so its not that, and its also a different sound the the aircon kicking in.

I have read that there are many Fiesta ST with a phantom click sound?

Any ideas guys?