David Cameron's old tutor at Oxford, Vernon Bogdanor, still sends him emails criticising his work, the Prime Minister revealed to a group of students in China.
Mr Cameron was speaking to students at Shanghai University, where he was quizzed on the UK's new rules for student visas.
The Global Times newspaper's criticism of the UK is stinging given that David Cameron has spent two days courting China's leaders.
David Cameron's visit to China has not been easy to arrange with the pressure for the trip coming from the British.
David Cameron hopes to mend relations with China as he brings a large trade delegation with him.