Chelsy Davy was driving Prince Harry 'nuts' with messages and calls during his training at Sandhurst.

An email written by former News of The World royal editor, Clive Goodman, to his boss Andy Coulton was shown to the jury at the phone hacking trial at the Old Bailey last Tuesday. The email was about Davy's constant blasting of calls and messages to her then-boyfriend Prince Harry during his training at Sandhurst.

'He's not allowed to use his mobile at Sandhurst until he's off duty. But she's blitzing him with dozens of calls and texts when he should be concentrating on training,' says the email.

'Harry can only field these after he's finished his training duties, sometime after 10pm. He keeps the phone on, but on silent. It buzzes and vibrates also frequently with new m [the message cuts off].

The email also reveals that the royal family 'likes her well enough but they're worried she's incredibly needy just at the time when Harry needs to be concentrating on himself.'

Finally, Goodman tells Coulton through the email that his team have 'been having a very quiet look at this independently and it works.'

Earlier in the trial the jury learns that the newspaper used phone hacking to get information on Prince Harry's alleged cheating in the Sandhurst exams by seeking help from an aide for his essay.

The prosecution alleged that the story was obtained via a voicemail illegally accessed by private investigator Glenn Mulcaire. In the said voicemail, Prince Harry was seeking information from his private secretary Jamie Lowther-Pinkerton to help out with his essay.

Mulcaire was also paid an extra retainer for the information he obtains for Goodman via phone hacking.

Goodman was convicted of phone hacking in 2007, and is now on trial in relation to alleged corrupt payments to public officials during his tenure at the now-defunct newspaper.

He and Coulman were also accused of paying a royal policeman £1,000 to obtain a copy of the Green Book, the telephone directory with all the home numbers of the royal family and their household staff.