A culture of low expectations in many schools has meant that bright pupils are being let down and are failing to gain top grades at GCSE, according to a new Ofsted report.
The report suggests that clever students become used to performing at a lower level because they are in classes where the work is pitched at middle-ranking students.
Chief inspector Sir Michael Wilshaw said it was "shocking" that, in some cases, school leaders and teachers did not even know who their most able children were.
More top news
The advertising watchdog has ruled the "beach body ready" campaign was not offensive or socially irresponsible.
Britain is set for the hottest day of the year today, with temperatures forecast to hit up to 34C (93F).
The Airports Commission is to publish its report and recommendations on whether an extra runway should be built at Gatwick or Heathrow.