[b]Collaborations wot haven't yet happened:[/b]
[indent]Jig & Ginger
Jig & Cal (in which they presumably have a bit of a spliff or something similar)
Jig & Biggie

Cal & Jig
Cal & Biggie
Cal & Ginger

Biggie & Jig (sounds like a comedy police duo show)
Biggie & Aunt Flavia
Biggie & Cal

Aunt Flavia & Biggie
Aunt Flavia & Ginger

Ginger & Aunt Flavia
Ginger & Jig
Ginger & Cal[/indent]

Obviously, collabs as the plot demands (which is why I haven't included Bliss who I presume is usually too busy cackling to collaborate) but these are the ones that haven't happened.