It is pronounced Shivorn, but spelt Siobhan.
Anyway, back to the thread.
I accidentally watched the tail end of this programme for the first time tonight, and I could not believe how buttock clenching it was. Their sickly sweet smiles when singing must make them go home with lockjaw. And that embarrassing bit where they have to sing the 'so long, farewell' bit to the poor bint who had been chucked off - they really looked sorry didn't they (not). They were just thinking, glad its you and not us! And that stage managed gesticulating of the hands - come back Ted Rogers all is forgiven. And how did the two who had to sing the song sharing the verses know which bits to sing - it must have been rehearsed. Suffice to say I will try to be more careful in future when channel hopping.