I've just spotted that on Control:Web, the Settings button against the Local Playback Zone allows you to choose a bitrate, from 64kbps up to 192kbps. I don't recall seeing this before so it might be a recently added feature (or perhaps I just haven't been very observant / curious when listening via a web page).

Ian

C10, TwinStore(RM), MC600, MS600, MS200, Explorer