Joe and his producer Josh do the editing and stuff for in the pan, Dianne I think is just in it, cause shes on tour.
The fact she manages to vlog, edit, do stage rehearsals, tech runs, m&gs and the actual show most nights of the week I highly doubt she has much to do with the production of in the pan. Then again some youtuber moan about putting out a video once a week and they don't do half the stuff she does, so credit where credits due, she definetely deserves to make some money from it.
I dunno how long they will last it depends who she's paired with, they will break up if her partner is from based too far outside London and she will have to stay there or if she is partnered with a hot straight guy and Joe's jealousy gets the better of them.
If neither happen they will be engaged this time next year.