This is not really the place for this complaint, but maybe some BBC-ites are reading.
The whole series of Dr Who has suffered from the most appalling sound mixing. The music is way too loud compared to the dialogue. The last episode was particularly bad — at times the dialogue was almost inaudible under the music. I had to constantly adjust the volume — down when the loud music comes on in the action scenes, up when the dialogue (without music) comes back. For God’s sake re-mix the thing.