English Symphony Orchestra tweeted that they support living composers. I checked out their gender stats to see if they support women composers.
13 concerts this season, 2 of which have 1 woman composer in them, 1 has Kapralova and 1 has Bacewic.
2/13 concerts with 1 woman composer, that is 15.3 % of concerts featuring a woman composer.
Also coincidentally the 2 concerts featuring a woman composer are in the Venus Unwrapped series at Kings Place.