There's been a statement from Camp 5 Seconds Of Summer in the past few minutes. An official spokesperson told Rock Sound:
"Michael is recovering well after being given the all clear by doctors. He will join the band on stage tonight at the SSE Arena for their third and final London show. Michael and the band would like to thank all the fans, well wishers and particularly last night's audience for their support. There will be no pyrotechnic production for the show this evening."
The 5SOS guitarist / vocalist was burned by onstage pyro at last night's London show.