We have the medical booked for later this month and can relate with some of what your concerns are. Firstly getting to London isn’t always the easiest and feel this is the hardest part of the whole process. Try and take a friend with you for moral support, failing that just try and relax and focus on organising the London trip and transport method. We have London Paddington train all booked for the medical with a nice walk, with ample time going and returning. Also think about your new life and focus on the positives and don’t worry (too much) on the days events.
we printed the SCR from Patient Access, (used App). Your record will have a section with documents and consultations. In there you will find all your mental health records, which you will need, (they will ask). If you don’t see any consultations notes ask your GP practice and they’ll add this, (make sure you log off/on for updates to be effective). I don’t think they will be concerned with the notes of non medical professionals, the words of CPN’s etc will hold weight.
finally, don’t leave too short of time. It’s better to twiddle your thumbs, then be in a rush. (Adding self generated anxiety)
good luck!