From what I recall/understand, it’s a problem that was covered in The Laundry Files, a series about a similar British government department - Everyone who uncovers the agency or is pulled into an incident in a way that’s undeniable, essentially, gets a choice: recruited into the agency to keep an eye on them(or in the case of the Laundry Files, to keep them under the entirely non-metaphorical geas of secrecy), or vanished under mysterious circumstances, ie, killed and erased. The Panopticon Warden being one of those, who managed to fail his way upward by virtue of The FBC being, generally, a casually lethal place to have a day-job.
Which naturally leads to an agency full of quasi-useless nonces in busywork jobs, byzantine bureaucratic nightmares, and all of it being held up and/or held together by a core of highly competent people and a hard-working sorcerer-in-chief personally handling more problems than they should need to, many of which were caused internally.
They’ve already released the first DLC that’s further exploring that universe, and reportedly, it’s very good.