New Education Secretary Nicky Morgan has been urged to avoid trying to "mark (her) mark" with "another raft of reforms" upon replacing Michael Gove.
Brian Lightman, general secretary of the Association of School and College Leaders (ASCL), stood apart from other leading education unions in paying tribute to the departing Education Secretary.
"As someone who has had extensive contact with Michael Gove I have absolutely no doubt that he has a passion for improving the life chances of young people," he said.
Yet Mr Lightman added: "Many of his reforms have been highly controversial and time will tell what the impact is."
More top news
A chilly evening and night with clear skies and tomorrow a little more cloud through Scotland and Northern Ireland again.
The three billion-year-old rock is the largest discovered in over a century - and could be yours when it goes under the hammer on June 29.
Hundreds of millions of hacked usernames from providers including Gmail, Hotmail and Yahoo are being shared online, according to an expert.