In October 2009, it was discovered that instead of the bio-ethanol fuel having been sourced from sugar beet grown in the English county of Norfolk (as had been advertised), it was actually made from wood pulp imported from Sweden. On learning this, Reading Borough councillors launched an investigation into how they and the Reading Transport Board could have been deceived. All the ethanol-powered buses have since been converted to run on the same bio-diesel mix as the rest of the fleet.