www.bbc.co.uk/programmes/b01p3nzl
They are also doing the radio WM carols over Xmas, but that's rather a low brow affair and they tend to cut the choir a lot compared with live and focus on the presenters . Last time the girls were fuming because the "best piece" in their eyes , was cut completely!
At least with choral evensong they cut the voluntary short if it overruns...