Well mine has developed a noise as well. This thread and
this thread here both kinda cover what mine does, but mine is slightly different.
My noise is like a metallic clicking noise rather than a "clunk". The gear box mount bolt tensions are fine and ther CV boots are all still in good condition.
It is coming from the front passenger side and it happens when any kind of torque is applied to the car - any change in speed gives the "click" and it happens in any gear including reverse, also sometimes when letting off.
Not sure if this is relevant or not, but when I compared my car with a MK5 Golf GTi, there was a fair bit more movement in my engine when you shook it by hand when switched off vs the Golf.
Checked Fuse F21 and its ok

. Any other ideas and suggestions welcome so I can get a heads up on it
Edit: Given that this fault is different, from those above, I wonder if it justifies its own thread?