How much would you pay to boost your child’s grades? If you’re one of the 2.5 million parents in Britain who hire private tutors, the data suggests about £40 an hour. But for a wealthy elite locked in an arms race to secure their offspring the best education money can buy, the answer is: whatever it takes.

Enter the super-tutors – top professionals operating at the peak of a secretive industry running alongside mainstream schooling. The very best can earn six-figure salaries from families who consider these sums loose change.

The Telegraph London