mange tout = snow peas.
sugar snaps are still called sugar snaps here.
courgette usually means green zucchini, we don't usually get the yellow. It's actually the same pattern: courge is squash in French, so courgette means little squash; zucca is squash in Italian, so zucchini means little squash.
no one uses capsicum for bell pepper anymore as far as i know but I think Australians might.
oh, and spring onion = green onion/scallion, if you come across that!