Neither Mickey or Jack is listed in pre-titles, but I think being an obvious member of the TARDIS crew for any period of time (as in, being someone who actively travels with the Doctor, rather than somebody who the Doctor is giving a lift home or whatever) counts you as a recurring character. And yeah, that's just the part 2 timecode. (I try <3)
Despite the fact that I don't think TGWD/TWWL is a two-parter, I'm going to argue that characters who only become recurring after the fact shouldn't be discounted; those two episodes are Ashildr's first appearance, so she should count as a guest character. Maybe? I'm not actually sure about this.