Two relevant links from the NHS:
1. https://www.nhs.uk/using-the-nhs/about-the-nhs/your-health-records/
"The information in your records can include your:
...
tests, scans and x-ray results"

https://www.nhs.uk/using-the-nhs/about-the-nhs/how-to-access-your-health-records/
which states right at the top of the page...
"There are a number of different types of health record, accessing them is free, and healthcare professionals have a legal requirement to allow you to see them."

Copyright isn't mentioned, but I think the above is enough to ensure you to have access next time you visit.