I'm glad to hear it Will, and to be honest I didn't expect anything else.
The point is that your friends at the session - like all the other people that some here would like to have been on TV last Friday - were not invited. The BBC knew what they wanted, and they got it - everything else is just ooffle dust.
The girls were invited, they happen to sing in that way, they gave it their best, and lots of people will have thought they sounded fine.
Criticising them for the way they sing is akin to complaining that Man U don't use the right cricket bats.
And as for the volume/amplification thing, well there are LOTS of really successful singers, including some you'll see on Transatlantic Sessions and the like, who are almost inadible in real life.
We live in the 21st century where microphone are commonplace. It is no longer necessary to be able to fill La Scala to get the gig. So we've been able to welcome a whole new small-voiced sound into the repertoire, and the repertoire is all the richer for it.