Really interesting question - I think it's irrational but for some reason neither Lilia&Matt or Darren&Emma have the same drama for me as the other couples. (I didn't watch series 1 so I don't have the same feeling with Brendan.) I think it's partly the 'they've had their turn' feeling, and partly the comparison - when I see Emma I think she's good but she's not Jill, and Lilia&Matt feel like Darren Gough all over again (My favourite - that got me watching the show - was Lilia and Aled). Please understand - I'm not saying I'm right to feel like this and I'm not criticising anyone, but I think it is a factor, personally. I also think, though, that Lilia is the best teacher of all of them.