Safer Internet Centre

How to set up filters on your home internet to help prevent age inappropriate content being accessed:
https://saferinternet.org.uk/guide-and-resource/parental-controls-offered-by-your-home-internet-provider

If you are struggling, phone your own internet provider and they will be able to discuss the various safety features they have available.
https://saferinternet.org.uk/guide-and-resource/parents-and-carers

Common Sense Media

You can search Common Sense Media for guides on a variety of platforms, including how to set up parental controls on devices like Xbox one/iphone etc
https://www.commonsensemedia.org/articles/online-safety

Open conversation is best when negotiating online safety with children and young people. Find guidance on these conversations here from the NSPCC
https://www.nspcc.org.uk/keeping-children-safe/online-safety/talking-child-online-safety/