'George is very poorly,' says a source close to the singer
London Royal Albert Hall show was pulled earlier this week
Singer forced to shelve tonight's gig due to a viral infection
Singer's new project will follow forthcoming orchestral tour
Singer also accuses police of taking money for information about him
Singer says he wants to make up for 'letting young gay people down'
Singer will play 12 UK dates later this year
Singer records 'You & I' for Prince William and Kate Middleton
Singer had said 2008 shows would be his last
Singer spent less than a month behind bars for drug-driving conviction