MI5 spy in court accused of attacking ex-girlfriend

An MI5 spy sexually assaulted and beat his ex-girlfriend - a fellow spy - after she left him, a court has heard.

The defendant, using the false name Mark Barton in court for security reasons, allegedly became obsessed with the woman following the break-up.

Southwark Crown Court heard Mr Barton tried to win her back but used "sexual and physical violence" after she rejected his advances.

He denies sexual assault, two counts of assault and one of harassment.

The pair met at work in 2009 and started what the prosecution called an "intense and passionate" relationship in 2010.

'Behaviour escalated'

Alison Morgan, prosecuting, said the break-up happened when Mr Barton became "obnoxious" while watching Andy Murray lose in the Wimbledon semi-final on 1 July 2011.

Miss Morgan said the defendant refused to accept the relationship was over and became "intimidating, violent at times and frightening" from mid-August that year onwards.

"His behaviour escalated as time went on and he desperately tried to convince her to restart the relationship," she said.

Miss Morgan said the complainant, referred to in court by her MI5 "pin number" 2363, told a number of people what had happened and sought advice.

Mr Barton was warned by bosses about his behaviour, Miss Morgan said.

The trial continues.

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