I did like them best from the semifinal tonight...  And I was pretty impressed with their audition, too.  I'm not living in the UK, so I've been following the show on YouTube and, as catty2k1 pointed out, I too found a link to one very professional video from Scala (where they're playing the same piece as in the audition).  It did make me wonder...  Also, what's the deal with Scala, now Escala???...  Did I get it wrong the first times or did they actually modified their name?.....