Freelander 1 Td4 - Noise Sounds familiar to Anyone

Hello All,
Anyone had that noise on his/her TD4 already - TD4 ? First it was when the air con was on.
After a while of driving it turned also up w/o air con. It seems to come from the air con belt
or somewhere there. As I was a bit away when it happened I'd asked LR garage and they said
drive slowly and keep the AA number at hand. It worked out with the slow driving. When driving
from 10 mph onwards the noise disappears. Was quickly in the garage today and the main
belt seems to be ok from the tension.
Can hopefully check the air con belt tonight. Could it be the / a chain?

BR
Matthias

Crank pulley on the way out, only fit a Corteco Pulley other's don't last.

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and a new gates belt.