I vaguely remember the series when it was first on (I was 9-10) and I got the DVDs a couple of years ago.
Very much in the 1970s BBC period drama pattern - if you liked the Duchess of Duke Street, Poldark, Secret Army etc, then this is along the same lines. It is mainly about the characters, and their wartime experiences, but that isn't a bad thing? Check out internet reviews for further details perhaps about flying sequences etc.
Highly recommended, I enjoyed it anyway!