A major plank of Livingstone’s election platform is that “A single bus fare is now up 50%”, see page 19 of London Elects “The Candidates” publication.
The recent history of TfL fares is provided by the Londonist blog. The bus fare that Livingstone is referring to is the Oyster PAYG (peak) tabulated below.
It was £1 for three years until Livingstone lowered to 90p it in the run up to the 2008 London election. This was not enough to get him re-elected but it does provide a basis for Livingstone’s statistical nonsense. When Livingstone was in power he raised bus fares by 43% from 70p to £1. His later 10p cut was totally unaffordable. At the time he made this decision the subsidy for bus journeys was already 33p per journey.
Of course Boris Johnson had to raise bus fares when he came into power. You can guarantee that Livingstone would have done too (he had previous after all). It would be much fairer to claim that Johnson raised fares from £1 to £1.35 or 35%. Not only was Livingstone’s rise bigger than Johnson’s it was earlier. Livingstone is relying on you having a short memory. Don’t buy it.