The review of an investigation into allegations three Norfolk schools received advance notice of inspection dates will report later than previously expected, it has emerged.

The initial inquiry by the school inspectorate Ofsted into the claims about Ormiston Victory Academy, Great Yarmouth Primary Academy and Thetford Academy found no evidence to support the allegations.

However, chief inspector Sir Michael Wilshaw ordered an independent review, headed by lawyer Julian Gizzi, after new emails came to light.

The review had been expected to report before Christmas.

However, an Ofsted spokesman said: 'Mr Gizzi's review is still in progress and is expected to report back later this month. Ofsted has pledged to publish the findings.'

All three schools were connected to Dame Rachel de Souza. She was principal of Victory at the time of its inspection, and the other two schools are sponsored by the Inspiration Trust, which she now leads.