Set up under Tony Blair to transform education in the poorest areas, academies are semi-independent, state-funded schools sponsored by wealthy individuals, universities and church groups. At Walthamstow Academy, Mrs Cordeaux had been fighting staff allegations that there was a "blame culture" in the school. The National Union of Teachers threatened to strike before the row could be resolved. Alasdair Smith, national secretary of the Anti-Academies Alliance, said the ULT resignations raised questions over whether the sponsor was "fit for purpose". However, a spokesman for ULT said the resignations of the two heads were the only departures to have affected the group since July 2007.