As of 8th January 2019 Sony Crime will move to Local Freeview which limits the areas Sony Crime is available.
To check if Sony Crime is available in your area please check the Freeview address checker.
Depending on your Freeview TV or box you should receive a notification advising you to retune.
Again depending on your TV or box you might find that this is done automatically for you. If not you will need to manually retune.