ABBA have shared their third new single since announcing their reunion last month, an exuberant cut titled ‘Just A Notion’ that will feature on forthcoming album ‘Voyage’ when it arrives on November 5.The song – which follows on from comeback singles ‘I Still Have Faith in You’ and ‘Don’t Shut Me Down’ – was initially recorded in September 1978 but didn’t make the final cut of the Swedish hitmakers’ sixth studio album ‘Voulez-Vous’ the following year.The new version features updated