My surgery won’t give me full online access to my records so I don’t know. I’ve asked numerous times. I just get the nhs app highlights. I can do prescriptions get results etc but not see actual notes.
In which case, raise a Data Subject Access request. There must be a definite reason for them to decline that, such as psychological frailty. They do have 40 days to provide the information.
I got somewhat miffed when a consultant told me I didn't need to know details of my test results, so I raised a DSA. My records were sent to me on a series of DVDs (there was imaging involved) and CDs.
To be fair to your surgery, you should be specific about what you want, but that could be all elements of your medical records, including test results and clinician notes since x-date. Asking for your life-long records could be deemed unreasonable.
You never know, that might just be the catalyst for granting you online access. If that happens, then please do ensure you ask for whole of life, full record and notes, else they can decide how much they give you - sometimes just the most recent period (in my GP's case that was two years).
Go for it. It is your information.