Socialite Jemima Goldsmith was bombarded with Twitter messages by a man who even arranged for a cab to pick her up at home so she could meet him at a hotel, a court heard.

Besotted Conor O'Mahony, 60, from Deal, hand-delivered letters to Ms Goldsmith's home and tried to talk to her over the intercom.

He then bombarded the 42 year old journalist and her friends with messages on Twitter and Instagram.

Hammersmith Magistrates Court heard that O'Mahony received a caution in 2015 for tweeting her five times a day and approaching her outside a hotel where he asked to take her to dinner.

The harassment stopped but began again last year.

Ms Goldsmith, the daughter of billionaire James Goldsmith and former wife of Pakistani cricketer Imran Khan, became so worried she contacted police.

O'Mahony, 60, pleaded guilty to one count of harassment on September 27, 2016.

Today, wearing a dark blue suit and floral tie, he brandished a letter he claimed was from the Queen whilst standing in the dock.

Emily Maunders, prosecuting, said: "There is a background to the offending, in October 2015 the complainant reported to police the defendant contacted her five times a day via Twitter.

"As I stand here I'm an innocent man. I have a letter from Her Majesty the Queen, I hope to make progress, I hope to work with you" - Conor O'Mahony

"He also travelled to her home address outside of London.

"The complainant wasn't present at the time, however she was concerned he knew where her address was.

"In April 2015 he attended an event where she was speaking, approached her and asked whether he was taking her for dinner.

"Her security staff intervened and had to take action.

"In September 2015 he went to her address in London and asked for her via intercom system.

"He then contacted her via Twitter. He said to the complainant 'I'm knocking at the door, the lights are on but no one's home. Try smelling the coffee or contacting the Met'.

"The complainant was concerned about this behaviour.

"The defendant also wrote her letters, all of which were hand delivered between June 2016 and September 2016.

"These were hand signed so it was easy to identify, which caused particular concern as he had been to her home address.

"The behaviour continued and started again on September 2016 when he sent further messages via Twitter, as well as to the complainant's friends via social media, on Twitter and Instagram.

"In particular the defendant ordered a taxi from Addison Lee to go to the victim's address and had been instructed to collect the complainant and drive her to a hotel with a message from the defendant asking her to meet him at that hotel."

While the details of the allegations were given to the court O'Mahony took off his jacket and put it back on again, then accused the prosecutor of lying.

In his outburst he said: "It's lies, untruths."

Before the hearing began he had to be ushered out of court by his lawyer, David Freedman, as he would not enter a plea.

He said in the dock: "As I stand here I'm an innocent man. I have a letter from Her Majesty the Queen, I hope to make progress, I hope to work with you.

"This is from Buckingham Palace, I have to show it to the court, will you not take this letter from the Queen.

"I have been extremely helpful in this trivial matter over this terrible woman - who doth protest too much, me thinks" - Conor O'Mahony

"My mother in South Africa and my sister in Australia now know me as a stalker, how will I get a fair trial?"

The court heard O'Mahony suffered from bipolar disorder which was diagnosed in 1999, but made worse by five years of skin cancer treatment and extensive dental surgery.

Mr Freedman said: "Since the caution there has only been one incident and nothing since September last year.

"My understanding is the alleged victim did not want to pursue the prosecution, she just wanted to see a caution."

O'Mahony had two previous convictions, one for drink driving in 2002 and drunk and disorderly in 2004.

District Judge Kwame Inyundo postponed sentencing O'Mahony until mental health reports could be compiled.

As he left court O'Mahony added: "I don't want to come back to Hammersmith. I have been extremely helpful in this trivial matter over this terrible woman - who doth protest too much, me thinks."

Westminster-born Jemima was married to Pakistani cricket legend Imran Khan between 1995 and 2004 and is identified in the charge under her married name.

She is an associate editor of New Statesman and European editor-at-large for Vanity Fair.

Her parents are millionaire financier Sir James Goldsmith and Lady Annabel Goldsmith, who is the daughter of the Marquess of Londonderry.

Her brother, Conservative politician Zac Goldsmith, 42, recently lost his Richmond Park seat and failed in a bid to become Mayor of London.

O'Mahony will be sentenced at Hammersmith Magistrates Court on March 13.