Oooh, another biochemist! Remind me to show you me chickens later. Erm, I mean welcome aboard, obviously, Gwen lovey. Your timing could be better but I'm ever so pleased to meet you.

Oh aye, I'm Iris. Iris Wildthyme. I've been teaching biology - oooh, it'll be dead useful to 'ave someone actually trained in teaching, I expect.

[And by useful she means that Iris makes up the syllabus as she goes along, and the random gaps and inconsistencies in her students' knowledge will drive Gwen batty. But Iris always keeps a lot of benefit of the doubt in stock.]