I am reviewing the series as a whole, rather than the books individually
The Biggles series is great adventure fiction: we get high stakes, aerial action (in most of the books), and a hero who is endlessly loyal, competent, and calm under pressure.
I love the dogfights, recon missions, and wartime scenarios.
Where the series falls short is character depth. Some attitudes and simplifications reflect the period in which the books were written. There are very definitely dated elements, but considering the era the books were written - overall the series performs well. More than a few of the stories defy plausibility, but who doesn't love to curl up with a good adventure book or 10?
“Never say die.”