The sudden resignation of a highly-respected schools chief prompted criticism today from a head teachers' leader.

Tony Thornley, director of strategy at Education Bradford, quit his job with immediate effect.

Education Bradford also announced that Ian Irving, director of change, has also left.

The move shocked and puzzled head teachers who have worked closely with Mr Thornley, a well-respected figure, since he took up his £85,000-a-year post less than 18 months ago.

Education Bradford refused to comment on the circumstances of his sudden departure.

But Mark Pattison, boss of Education Bradford, said: "This change will give us an opportunity to reflect on the way we are structured and operate as an organisation. It provides a good opportunity to re-shape the organisation to better meet the needs of the contract and of schools and young people."

The changes to the senior management team come just a year after it was formed.

Speaking from his Ilkley home, Mr Thornley said he was not able to comment on the reasons.

But Gareth Dawkins, convenor of the Bradford Upper School Heads' association, said: "I have great respect for Tony and his departure is extremely unfortunate.

"He has carried out his duties with great style, panache and not unlimited skill.

"I am shocked and gutted. This should have been something Education Bradford ought to have avoided. He is a person of high calibre, respected by heads. If you lose your director of strategy, where is your strategy going?"

"I did have concerns about the match in culture between a profit-making company and the public sector. I was reassured because Tony had a clear commitment to kids."

Councillor David Ward, executive member for education on Bradford Council, said: "Without a doubt this is a sad loss - we can't pretend it's anything other. He's someone people make a point of complimenting from all sides."