Good day infgrs! I am glad to be able to provide assistance to you today. I understand that you are checking if Window 11 will be activated if you use a Windows 11 English-United Kingdom ISO. The license or the OEM key from your device should and will still activate as it will be the one to be carried over if you were to install Windows 11. You can also check out the links below for reference with regards to doing a clean install for Windows 11.
https://pureinfotech.com/clean-install-windows-11/
https://www.windowscentral.com/how-do-clean-ins...
https://www.yourwindowsguide.com/2021/09/clean-...
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
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Regards,
Paul R.