From what I saw last night, I think most of the singers aren`t necessarily miming but they seem to have some sort of electronic enhancement to their voices. That is not unusual - it`s common in live concerts.
I don't genuinely watch the above but like any one else switched over to see if it had got "better".
Cheryl had gotten up to "mime" with a tarzan outfit - I said to myself "Je$us - you have the cheek to adjudicate when you don't have a note in your head". And I am deaf = Thank God.
But, on a very different tangent - I think Mel B along with Sir David Attenborough was on with Wossy some weeks ago - as Sir David was going on to talk Wossy (I loathe him() Mel B - appeared/pretended to hit Sir David on the bottom. Insolent Cow. Anybody see that.