A Bradford secondary school has made insufficient progress in reaching targets identified by Ofsted, the watchdog’s inspectors have found.

Thornton Grammar was told to make improvements in several areas following an inspection in 2010, in which it was judged to be satisfactory.

An inspection in December to check on progress found there was too much variation in the quality of teaching with students not making enough progress. Data on pupils was not used consistently well enough.

A letter from inspector Linda Tetik noted changes to leadership, made since the appointment of head Chris Sampson, which had strengthened the role of heads of department.

Mr Sampson said: “These changes have resulted in a sharper focus on school improvement. We were pleased that Ofsted noted that there had been improvements in teaching and learning since the last inspection.”