'Sheezus' singer was taken ill after filming Channel 4 show 'Alan Carr Chatty Man'
Singer looks likely to score her second chart-topping album with latest release
But singer admits she's unsure whether she 'can stretch to a fifth'
The singer debuts a host of new material from 'Sheezus' at the event
"I wish she was still here" singer says of the late pop star
Singer mimed to song during G-A-Y performance in London on Saturday (April 26)
Singer says hearing people's opinion of her new music was 'one of the most horrible moments of my life'
'Sheezus' singer says she hadn't found her voice again until the feud
Singer says Winehouse 'was a prisoner' prior to her death in 2011