@jamesl2021: Is the issue present on all channels and sources, and when viewing in a well-lit environment? If you head to Settings > Support > Self Diagnosis > Picture Test, is the light bleed visible in the test image? If so, please reach out one of our authorised Support Centres to arrange for an engineer to inspect the device. To find your nearest one, please follow the link below, select 'TV & AV > Television' and enter your post code.
https://www.samsung.com/uk/support/service-centre/
I'm unable to verify the cost of the service from this position, and this must be done by the engineer as part of the inspection process.
