Two separate tickets does not mean that your bags cannot be checked through to the final destinations. It would be extremely unlikely for a well known full service airline of the stature of BA or 9W to not have at least an interline baggage agreement, if not both baggage and ticketing.
I had bags checked through on RB/KLM Airlines and on TG/SAS. Does anyone know what RB is?
Now don;t cheat and look up the codes.