Dizzee Rascal: Roundhouse, London ****

"DIZZEE RASCAL for prime minister, yeah?" As if to emphasise that he is more than just an east London grime MC these days, Rascal ended his first song of this show by booming out a soundbite from his interview with Jeremy Paxman on Newsnight last year. If the Paxman encounter weren't proof that Rascal is mainstream now, three No 1 singles in 12 months make a pretty good argument – as did this Electric Proms set, which teamed him up with London's jazz-inclined Heritage Orchestra.