ey Acme, hey hey Acme!
Haha my Octavia doesn't have the light. Yours must have a better trim level.

Also, got a video of the noise. The screech happens when you press the AC button even with the engine off. Does anything AC related besides the fan on the condenser turn on without the engine being on? Obviously the compressor is belt driven.
Then you can hear the clicks after turning the car on, sometimes its worse than this. Think that may be the compressor pulley bearings and/or compressor clutch.
The rattle you hear after the clicking stops (aside from the normal engine rattle) is the tensioner.

After sitting all night in the 'cold':
And again after sitting for 8 hours in the warm multi-storey, slightly different/shorter squeal this time, and minimal/no clicking after starting:
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