"Flaming Nora" is a British slang phrase that means something like "holy cow" or "wow," typically used to express surprise or shock. It's a bit of an odd phrase, but there are a few possible synonyms you could use to convey a similar sentiment. Some options might include "goodness gracious," "ye gods," "my word," "blimey," "crikey," or "gosh darn it." Of course, context and tone are key here, as different phrases might be more appropriate for different situations. But if you're looking for alternative expressions to "flaming Nora," there are certainly plenty to choose from in the rich tapestry of British slang.