I hear the Bristol organ on a weekly basis and very fine it is too. I have never noticed the problems with the action that have been mentioned. Thinking that my normal position lurking near the back might flatter the sound, I went into the choir yesterday to listen to the final voluntary. I still heard no odd noises and I can only guess there must have been a microphone in a very odd place. Even so, my not bad tuner and stereo system didn't pick up anything during the broadcast.
By the way, there was a guest choir singing at the morning service of the day of the broadcast. A consequence of moving CE to Sunday?
PS I remember hearing Fernando Germani as a schoolboy in Glasgow and being blown away (almost literally) by the Reubke sonata.