With her "mockney" accent shot to pieces ("I think I caught something over the weekend," she claimed), the 21-year-old's hour-long set was nothing better than a high school talent show, trudging lethargically along like some moody adolescent.

A cross between Catherine Tate's irritatingly ignorant teenage creation, Lauren Cooper, and a Queen Vic barmaid from EastEnders – summing up both her attitude and vernacular – Nash looked like she'd rather be somewhere else.

Devoid of any charisma, and mumbling her way through tunes about skin imperfections (bless) and d***head boyfriends, any hope of hearing Nash above the muddy sound mix was virtually impossible due to a sizeable chunk of the audience chatting loudly throughout the concert. A shame, but fame, it seems, has come too fast for the former acting student, whose cynical Cockney sneer is a façade to her comfortable middle-class upbringing.

Things livened up a little when she brought out "some friends", in this case half a dozen people in white afro wigs, dancing around in skeleton outfits, but by then the damage was already done.

Nash's girl-next-door veneer is a nice antidote to the never-ending string of seemingly bona-fide female singer-songwriters thrust upon us in recent years, but if she's going to make a real dent in the music world she'll need to give every performance her all, even when she doesn't feel like it.