"Leave Before the Lights Come On" entered the UK Singles Chart at number four on 20 August 2006, becoming their first single not to top the chart. It did, however, reach number one on the Scottish Singles Chart, becoming their third consecutive number-one in that region.
On August 20, 2006, "Leave Before the Lights Come On" debuted at number four on the UK Singles Chart and was not their highest-charting single. It nonetheless topped the Scottish Singles Chart, becoming their third consecutive number-one hit there.