TOPIC:

Nearly every time I start the car up from cold, there is a crackly noise coming from the dash that lasts about 5 seconds. I think it’s specific to the air ducting but not sure. When the car is started when warm, it doesn’t happen. Anyone else familiar with this?

Same with me since day one (already two and a half years). I've accepted it's normal.

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I had the same problem and it was eventually traced to a label around the dashboard wiring which had come unglued and was catching on one of the air con/heater fans. Bit like as a child when you peg a playing card against the spokes of your bike to sound like a motor.
Main dealer had quite a job tracking it down but a simple fix, throw the label away

I don’t suppose you know where to access this label do you before I start dismantling the entire interior of the car?

There was a video some time ago on Youtube showing a guy dismantling the dash, and holding in hands the vents ducting construction;
It seemed like plastic parts poorly connected delivering plenty of intensive creaking sounds. Even after decent efforts to tape the different parts, some creaking noises were there.

My Kadjar must be one of the worst assembled vehicles; entire dash reproduced all kind of noises, depending on hot / cold / sunlight exposure and tarmac surface.
After several visits to the dealers within warranty, situation has been improved to an "acceptable" (=easier to live with) level of noise but far from anything called "quiet". For the record this is a car with less than 30K Kms most of them on high quality highway tarmac & just over 2,5 years old.

Overall very poor assembly quality (plus some unacceptable engineer deficiencies such as the rattling noise produced when windows are slightly opened) for a car Renault positions to the premium category (above QQ level).

Think it's possibly this one