I've never seen them in stores, even when I was in Fiji and they actually had whole sections of the store devoted to biscuits and cordials and other British-sounding things, and it probably wouldn't occur to me to eat them if I did see them, because I'm weird about chocolate combined with fruit flavors (I like chocolate with stuff like mint or caramel or peanut butter or fancy stuff like rosewater and absinthe and earl grey tea, but not fruit).