Scores of primary schools in Kent are being prevented from sending out end-of-year reports for 11-year-olds because they have still not had confirmation of their Key Stage 2 results.

Robert Straker, who is the Kent representative of the National Association of Headteachers (NAHT), said a number of schools had contacted him with complaints that the exam marks for pupils in Year Six had failed to arrive. In some cases, while schools had been given marks, exam scripts had yet to be returned, making it impossible for schools to decide about appeals.

Mr Straker, headteacher of the Anthony Roper Primary School in Dartford, warned that with just days to go before the end of term, parents may have to be sent their child's reports in the summer holiday, depriving them of their right to a formal consultation with the school.

He also said many schools were discovering discrepancies in the marks they had got back and their predictions.

"School reports are supposed to be out because parents have a statutory right to a consultation but for many Year Six pupils, they cannot be sent out," he said.

"A lot of schools have got the marks but not the scripts. It is a complete shambles. If reports are going out, they are going out with provisional scores or none.

"Most schools will not be able to appeal yet in some cases parents will have results that do not reflect the reality. Many schools who normally get 95 per cent at Level Four [the national level expected] are getting lower marks.

"The Government must not publish the league tables because the results will not reflect the reality."

Mr Straker added there could be repercussions for secondary schools, who rely on Year Six assessments when making decisions about which ability groups new pupils should go into when they start in September.

Delays in marking the Sats have been blamed on the American company ETS that has been awarded a five-year contract to do the job by the Qualifications and Curriculum Authority.