UK Issued WHV extension

Hi! I am a citizen of the UK and i have a current WHV, it was issued AFTER the start of December 2024. With the new law changes, i know that I should be able to extend it for another year, but as this only applies to visa issues after December 2024 no one seems to have really done it yet or have any idea what's going on. Where i live does not have an easily accessible immigration office. Online one article says as a UK citizen i should be able to do this from with the country… but I do not know how to go about this? Does anyone have any idea or experience extending a WHV?

Thanks

by DragonCatStar