More than “something” - and it was actually consummated (in particularly improbable circs , even by TA standards) in AmEx. Jazzer nobly stepping aside so Fallon and Plank could get together was actually quite a touching moment mainly down to how well Ryan Kelly played the scenes leading up to it.
I always felt Fallon and Jazzed would have worked well as a couple. She would have “tamed” him (I’ve always felt his macho, Jack The Lad posturing was covering for not being with her) while he conversely would have encouraged the wilder, spontaneous and artistic side that once made her an interesing character. Plank simply drags her down to his depths of tedium.