As regards Dave Arch, I've noticed a lot more pre-recorded music being used this series - his band is actually quite small (no strings etc) so they have to rely on tapes.
I've often wondered if the contestants have an accurate version of the 90 seconds of music that they will be dancing to on Saturday for their rehearsals during the week, complete with the ending, which is often sudden, and crucial.
Apc - bad news, I'm afraid: Claudia is taking over Graham Norton's Saturday Radio 2 show.