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unknown wrote:

As the image is a custom one, only the kernel is built from RPi Sources.
This pretty clear, I would have thought.

To one well versed in building distributions, yes, but not necessarily to one who has only used distributions! Not until now, anyway

unknown wrote:

Where as you were attempting to install headers from the Debian repo

 
I was but at that point, didn't realise the significance of the kernel being sourced from a different place to the base distribution.

unknown wrote:

The kernel should load the drivers without any user intervention.

 
It does now load on boot.

Thank you.

As the image is a custom one, only the kernel is built from RPi Sources.
This pretty clear, I would have thought.
Where as you were attempting to install headers from the Debian repo

The kernel should load the drivers without any user intervention.

Thank you very much for your replies. I did read all of this thread (all 7 pages!) but didn't quite make the connection that the linux-headers would be named differently for rpi. I've used the 'sudo apt install linux-headers-$(uname -r)' a fair few times in the past but it's the first time I've noticed a mismatch between uname and the installed headers. Every day is a learning opportunity - even with a Bank Holiday brain.

I also did try just plugging the dongle in but according to this the drivers are not merged into the kernel until 6.13. The WiFi in my workshop is pretty weak - my NUC with two antennas struggles to with signal from the AP - I suspect the foil faced insulation board is creating a bit of a Faraday cage. And it's the ISP supplied router/AP at that end.

Once I'd 'discovered' the headers were already installed, I did the Basic Installation for All Distros and success!

For anyone else following along, the RTL8811AU chipset requires the rtw_8821au driver to be loaded (modprobe'd) as per this issue .

Thanks again, much appreciated.