 Running concurrently to their April 2008 UK tour, the band made numerous in-store appearances in the week of release in cities such as Glasgow, London and Newcastle, meeting fans and signing the single, thus aiding the promotion of the release and continuing their reputation for strong fan interaction.Upon its first release in 2007, "Parallel Worlds" peaked at number 31 on the UK Singles Chart and number one on the UK Indie Singles Chart.The re-release landed at number one on the Scottish Singles Chart and number 22 on the UK Singles Chart.