:::I dont perceive a conflict here. But SCB is the definitive source and we should rely on the Official Roll as is until it is amended. -   

 I would not like to think there was a conflict here. I am myself an academic and I have cited both G.E.C.'s The Complete Baronetage as well as Lord Fountainhall himself, someone, I would have thought, given his legal position, as unimpeachable. I don't really know how much better than that one can get!