M1 Macbook Air Kernel Panic

Your Profile showing MacBook Air 13″, macOS 11.1 there is the 11.2.3 update available and may fix? your issue.

Hello d0mUK,

Thanks for asking the Apple Support Communities for help with your Mac and unexpected restarts. 

Please start by checking the troubleshooting provided in this help article: If your Mac restarted because of a problem - Apple Support

Even if you are not receiving any alert or error messages, there are many great troubleshooting steps within this article that apply to your situation, and can help isolate the problem between software and hardware.

You can also check this article for more hardware diagnostics and troubleshooting using this article: Use Apple Diagnostics to test your Mac - Apple Support

Thanks and have a wonderful day.