I think what I did was:
Settings/ click on your name/ iCloud/ private relay/ turn private relay on
Then
Settings/ WiFi/ press the little i by your WiFi network/ turn off iCloud private relay
To see TikTok’s when out and about on 4G
Settings/ mobile data/ mobile data options/ turn off iCloud private relay
think that should work. Private relay is turned on whether you accept it if not so need to deselect from the networks you use. The update means that you now have to keep saying yes to download content on your emails too, which is annoying