Acquiring information about your treatment tends to work best if you make a direct request, at the start of each meeting, for a copy of any relevant information derived from that hospital visit (this might be done verbally, speaking to the health professional- alternatively there may have been something in the paperwork you received early on from the consultant, to the effect that 'if you would like to receive...x, then tick this box').
Requesting info' this way, it's a simple matter for the admin staff at the hospital to just cc (add your name) to the relevant people who are sent a printed copy of that meetings' plan or test results.
By contrast, when people ask for information retrospectively, it adds another layer of administrative difficulty when hard pressed hospital staff have to search for the info' and gain clearance to give it out. Not everything is computerised and different health professionals may use different computer systems that don't talk to each other. Your medical notes may be simply hand written in a big cardboard folder which contains everything and is stashed away in medical records until the next phase of things. Make no mistake, it's not always about people deliberately keeping information from you. This is often the reason why hospitals may charge an admin fee for information retrieval- someone in the hospital has to do the leg work to find that info'- and it is the NHS, you haven't paid for extra admin. There's generally a form to fill in relating to the Freedom of Information Act as well.
It would be a very expensive and wasteful thing to do if every patient received every bit of information regarding their treatment- and in many cases ( at the risk of sounding patronising) may provoke undue anxiety and misinterpretation by the patient /and family.
Having said all this, I had my treatment at a hospital which prides itself on its' level of engagement with informed consent. There were notices: ' Please ask if you would like a copy of all the correspondence which we send to your GP'. Well, I did ask, but so far, all I have had was a PSA test result . I know the GP has had histology results, etc, etc. I will have to challenge them at the next visit regarding their failed promises.