Oasis are no longer the singers of the biggest-selling single never to reach number one in the UK charts, it’s been confirmed. Wonderwall, the classic 1995 tune performed by the Gallagher brothers and their bandmates, has now been overtaken by a single from US rock group, The Killers. Two decades on from its release, The Killers toe-tapper Mr Brightside has been named as the new biggest-selling single never to reach number one, Official Charts said. Released 20 years ago this month, the song peaked at a very modest number 10 in the charts but continues to dominate the airwaves to this day. The…