I intend to fill up on podcasts over the school/summer holidays.

No my question; but some great answers and will take a look too. Great community sharing!

I listen to a lot of true crime on Youtube. I do other things while they are playing in the background as they are ones that aren’t really visual.
My favourites are;
That Chapter
dreading (crime and psychology)
Dr Todd Grande
this is MONSTERS
Beside the Dying Fire
Stephanie Harlowe
BlueDot Crime
Red Tree Crime
JCS – Criminal Psychology

True crime Australia and my all time fav is casefiles. They have tones of episodes and free to listen. 10000% recommend

I mainly watch them in YouTube but they are also available in podcast form; this is monsters and somewhere sinister. Both are true crime from the same creator.
Our all time favourite podcast is Futility Closet. It’s no longer making new episodes but has over 100 to listen to. It’s about the wonderful and wacky curiosities of history, literature, language, mathematics. And a lateral thinking puzzle at the end of each episode. It’s a great listen.

Sorry, I can’t advice you. I haven’t listened to a podcast in years

Forgotten Australia. It covers so many topics and is very interesting.