In September -- when Sarkozy was still president -- three investigators engaged in an hourlong search of his political party headquarters, seeking documents linking his campaign to the alleged political contributions from Bettencourt.

CNN: SHARE THIS

In September -- when Sarkozy was still president -- three investigators engaged in an hourlong search of his political party headquarters, seeking documents linking Sarkozy's campaign to the alleged political contributions from Bettencourt.

CNN: Attorney: Sarkozy's home, offices raided

The NUT's campaign against the linking of pay to performance comes as a headteachers' union has called for a slowing down of the pace of reform.

BBC: Ballot demanded for teachers' performance pay