I think the usual thing to do with a series of short stories (like, say, Sherlock Holmes), is to adapt each individual story to an episode.
Now, I've never read the Biggles stories, but since it seems to be more action based...you'll probably end up having to put in more dialogue. In order to, you know, set up the time frame (at least in the first episode), what mission he's going on, why he's going on it, things like that.
Plus, maybe to break up the monotony of planes and stuff flying around?
Anyway, there probably will be character development in all that.
Of course, this is all theoretical, having never read the books/stories or written a script.
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