Forensic psychology intercalation - GBS Status

I'm interested in applying for the intercalated degree in Forensic Psychology at the University of Kent as part of my medical studies. One of the requirements for this course is obtaining the Graduate Basis for Chartered Membership (GBC) from the British Psychological Society (BPS). Could someone please explain the process of applying for the GBC, specifically in the context of an intercalated degree from medicine? Any guidance would be greatly appreciated.

You need to have completed either an undergraduate degree in psychology that is accredited by the British Psychological Society or a BPS-approved conversion course (an intensive one-year Master's). I'm quite surprised that MSc is listed as an intercalation option. There won't be that many medical students who qualify for it and the few who do are less likely to intercalate, as they'll have another degree already.

Yeah I believe it was a mistake by intercalated website

Assuming the info on that site is otherwise current, Kent does have some good intercalation options that you would qualify for. They have a strong research and teaching centre focusing on autism and intellectual disabilities, the Tizard Centre, and if you did one of their MA/MSc programmes you could tailor it to an interest in forensic psychology and the criminal justice system. They have staff who specialise in that area.
Before med school I was a psychology research fellow and lecturer, and I also worked in CAMHS. I'd be happy to share what I know about any other intercalated psychology programmes you're interested in.