I thought sultanas kept them regular?

Rach, that sounds like lovely weather! Our bedroom is boiling tonight, thank goodness a cool change should be here any minute!
Sounds tough with Jack...perhaps get him self settling first, by putting him in his cot, going out, when he wails, go back in and start again. Something else you could do is sit in there with him, with a book if there's enough light, or just in the dark, so he knows you're there and see if he'll settle that way? Dunno. I've noticed they're getting to tantrum age though, so it's just a matter of knowing what is real upset, and what is just screaming because they didn't get their way but now they can't remember why they're screaming but they're all worked up!
Whatever you do though, you're going to have to be persistent, til he learns what the new routine is. Perhaps some cues like a book before bed or something, so he knows what's coming? I'm sure the others will have some good ideas.

Jodi, that's a sweet name. I really like Stella too Caddie! You'd best have another.

Wow Shell, that's a long time to go without Matt! Glad your sis will be keeping you company.