I’m confused by OP referencing Business Plus in the context of researching F fares/routings.<snip>
I was confused by this as well. Though I understand a business plus fare includes FFD as a benefit I don't believe that would in any way entitle the passenger to things like the BA CCR, which the OP referenced a couple times. First is first, business is business. Business plus is business with some additional benefits bolted on.
I do not believe BA CCR is at all in scope with a Business Plus fare. I guess the OP needs clarify what class of service they would really be booking.
Regards