I doubt they'd go to the effort of supervising a trial week with training just to dismiss you afterward. As long as you don't set the roses on fire or something, I'd bet you've got a job. And how early are you talking? You said you've got early uni too, haven't you? Either way, good luck managing a school-plus-work schedule. I've always respected the people who could pull off both.
I think British professors being perverted is something of a stereotype over here, one of the lesser-known ones. And last-day cramming sounds like a good description of university assignment completion practice across all countries, to be fair. I'm guilty of that from time to time, so I can't laugh with you. ^_^;
Congratulations, Calamity! Are you interested in floral arts? It sounds like a peaceful and pleasant job. I hope you get it. =)