I find it concerning that they added this in: "I consent to my relevant medical records and the details of my condition being shared with the Emergency Contact below and/or with member(s) of the Hospital Liaison Committee" that is then followed with you having to supply your NHS number (that's new!).
In today's world of data protection - the idea of giving someone (the witness and the HLC) legal access to your medical records is, in my opinion, a step too far. Although it says "relevant medical records" - it doesn't take much to scroll through a data page to find more information.
HOTB