Hey @Phillb ,
hope you are having a nice Friday. can you tell me if this is happening in all light conditions and pictures? Can you run a test on the phone to see if there is anything wrong with the camera? To do this go to menu> Samsung> Samsung Members> Get Help section of the app (this is at the bottom right side of the screen when you launch the app) > Interactive Checks > Camera.
If the test results show that there is anything wrong with it, please follow the @SjorsK advice and take the phone to one of our Support Centres to be examined. Take a look at this link to find your closest one: https://www.samsung.com/uk/support/service-centre/