Yes, but Flybe is in administration. All depending on the ultimate time-frames, it may be that OP is due as much as EUR 300 (50% of EUR 600 as the cancellation is outside 7 days, but under 14). However, his claim would be an unsecured debt and thus the chances of collecting it in administration less than slim and likely nothing or a tiny pittance at some time in the distant future.
Thus, legally yes but practically no.