Replacement back glass and frame for the iPhone 8 Plus. This will give you the body of the phone to transfer all existing components into it.
Price breakdown for this is £40 for the back and frame, and £100 to transfer over components from the original back and frame. Includes free shipping and a video of the phone being repaired.
This is a very specialist repair and it is strongly advised to allow a professional to do this repair as opposed to attempting it yourself.