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Though much of the information in your medical records is available online you can still make a request for this information. The Freedom of Information Act 2000 does not give people access to their own personal data (information about themselves) such as their health records, and instead you use a subject access request.
The Patients Association broadly covers how to view your medical record (including various situations)
Seeing your medical records Seeing your medical records | The Patients Association
As the Information Commissioner’s Office suggest
if your request is for information about yourself, such as your medical records, you should make a subject access request under the Data Protection Act. How to access information from a public authority | ICO
The information Commissioner’s Office provide a guide how to make a subject access request.
From the Information Commissioner’s Office
Your right to get copies of your data Getting copies of your information (SAR) | ICO
This includes
You also have a right to get your data corrected as the Information Commissioner’s Office suggest
Your right to get your data corrected Your right to get your data corrected | ICO
Though as is explained by the ICO this is not always straightforward.