The Britain's Got Talent live shows have started, and if anyone knows what it's like to take part in them, it's last year's winners Collabro. So who better to ask what they think of each night's show?

We've had our second semi-final on Britain's Got Talent now, and some people who know just what it's like to hit the live shows are last year's winners Collabro. So each day, we'll be bringing you ...