Now that only four X Factor contestants remain, the show’s production team knows it has to raise the bar again and again to make sure that each episode reaches even headier heights than the last.

And that’s got a lot to do with what X Factor themes are chosen. For example, Saturday’s X Factor was all about the Best Of British, which allowed the remaining X Factor contestants to sing about a million Queen songs – technically making the Best Of British Night a Best Of British (And A Bit Zanzibarian) Night – and an American version of a Sting song. And this week, we have a feeling that the X Factor theme is ‘songs’. We’re especially looking forward to that one.

But who’s going to win X Factor? Here are the X Factor betting odds for Leon Jackson and Rhydian Roberts, with help from Paddy Power…