Just an update on this. Screentime and other time limiting measures were not working at all for me. About a week ago I deleted all apps other than communications. Apple make it so that you can't remove Safari so I removed it as best as I could both from homescreen and app menu. There's some setting somewhere to reinstate it but I can't remember where it is and even if I did it'd take me more time than I can be bothered spending. If I need to look anything up internet wise I can wait until I'm on a pc which more often than not is only when I'm making music.
What's interesting is the amount of times a day I think of a question and think immediately I'll just Google it. Then I realise I can't so I just let it go. Patience, tolerance and impulse control all wrapped into a single package. And as someone said earlier, even if I haven't checked any forums for a day or so I haven't really missed anything.