about characters...
Regular characters are the faithful few that keep returning in adventure after adventure. References are actual characters (you mean Biggles is not real? - surely not) that are mentioned, usually when Biggles is trying to prove a point. Bitparts are all the others.
Regular characters are listed by their common name (eg Biggles, Bertie, etc). The others are listed by "surname, firstname (titles, if any)". For example Sir Giles Mancroft is listed as Mancroft, Giles (Sir).
means you can view image(s) of the character as part of the details recorded here. Rare for the bitparts but there are
pictures for most of the regulars and some of the references.