Birmingham-Copenhagen is likely being pincered from 3 sides as LTN has seen big expansion on the route from Easyjet and Ryanair, as has MAN from SAS and Easyjet and I think BRS has seen slight increases from Easyjet too.
Copenhagen July 2015
Stansted (-86%), Heathrow (-2%), Manchester (-1%) and Bristol (-19%)
Luton (+100% with 35,669 Pax)
UK total all airports +14%
Luton is the winner