Just to clarify a few points:
BA are starting to operate BHX-MXP but this route has been dying off from Birmingham over the past few months so they are welcome to it.
The Maersk BHX-STR has historically been a long standing route at Birmingham and duo will continue to operate on this route - twice daily. After a good franchise relationship for many years BA have now decided to compete with duo on the STR route - thats gratitude for you.
I wouldn't say that BA were picking up the 'ex routes' operated by Maersk because Maersk/duo actually owned the route and not BA.
duo have chosen to operate the following routes from Birmingham:
Berlin
Cologne
Copenhagen
Geneva
Gothenburg
Helsinki
Lyon
Nice
Oslo
Stockholm
Stuttgart
Vienna
and the following routes from Edinburgh:
Milan
Zurich
Oslo
Geneva