Singer takes to Twitter to say he would be 'up for it'
He stresses that The Libertines 'have never not been a band'
Meanwhile, Pete Doherty plays gig at Rose Ball in Monaco
Screenings have been postponed as director Roger Sargent is ill
Singer is 'sure' pair will pick up where they left off 'when it's needed'
Film will also be shown at six screenings across the UK next month
Carl Barat and John Hassall give Q&A talk at Copenhagen International Documentary Film Festival
Both Carl Barat and management dismiss reunion rumours out of hand
The estranged Libertines bandmates post a picture of themselves together
Libertines and Babyshambles man to play London gig this week