Pictured: US diplomat's wife, 42, 'who killed' British teen outside RAF base

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Smiling broadly, including on her day, these are the first pictures of the American diplomat's wife who fled back to the US claiming immunity after allegedly killing a British teenager with her car.

Anne Sacoolas was travelling on the wrong side of the road for 400 yards before hitting Harry Dunn, 19, head-on - and her own 12-year-old son was in the passenger seat, it was claimed today. 

It came as Downing Street urged the US to 'reconsider its decision' and turn her over to the British immediately. 

Boris Johnson's spokesman said: 'The judicial process should be allowed to take place and we urge the US to reconsider', adding Foreign Secretary Dominic Raab will meet the victim’s family. 

Harry, 19, suffered horrific multiple injuries in the August 27 collision outside RAF Croughton in Northamptonshire – a US intelligence hub in Britain.

The driver was named last night as 42-year-old Anne Sacoolas – who left the country just three weeks after arriving and has claimed diplomatic immunity, despite facing possible charges of causing death by dangerous driving. 

Today it emerged Mrs Sacoolas and her diplomat husband Jonathan only arrived in Britain in early August and their three children were enrolled in the £19,000-a-year Winchester House private school in Brackley, where Harry's father Tim Dunn is head of maintenance.

Harry's bereft mother Charlotte Charles said today: 'The police have the CCTV footage showing that she pulled out of the RAF base on to the wrong side of the road. Harry had no chance'.

She added: 'We are utterly shocked and appalled that somebody is allowed just to get on a plane and go home and avoid our justice system'. 

Anne Sacoolas was travelling on the wrong side of the road for 400 yards before hitting Harry Dunn head-on - and her own 12-year-old son was in the passenger seat, it was claimed today.

Sacoolas (pictured on her wedding day in 2003) was also travelling on the wrong side of the road for 400 yards before hitting him head-on, Harry Dunn's heartbroken parents claimed today

Anne Sacoolas (pictured on her day in 2003) was also travelling on the wrong side of the road for 400 yards before hitting him head-on, Harry Dunn's heartbroken parents claimed today

The parents of Harry Dunn, Charlotte and Tim, have called on Anne Sacoolas to come back to Britain to face the music after she allegedly knocked down and killed their son before claiming diplomatic immunity

The parents of Harry Dunn, Charlotte and Tim, have called on Anne Sacoolas to come back to Britain to face the music after she allegedly knocked down and killed their son before claiming diplomatic immunity

Harry Dunn, 19, was killed on August 27 in a car crash in Northamptonshire - the woman accused of hitting him with her car has fled to the US and claimed diplomatic immunity

Harry Dunn, 19, was killed on August 27 in a car crash in Northamptonshire - the woman accused of hitting him with her car has fled to the US and claimed diplomatic immunity

The crash took place in August outside RAF Croughton in Northamptonshire (pictured) ¿ a US intelligence hub in Britain

The crash took place in August outside RAF Croughton in Northamptonshire (pictured) – a US intelligence hub in Britain

Harry's mother Charlotte Charles told Sky News: 'She travelled on 350 to 400 yards on the wrong side of the road. It was a head-on collision - we later lost him in hospital. 

'We are not coping. We are literally getting through hour to hour every day. Harry always fought for what was right so we are honouring him by doing this.

23,000 in UK are given immunity 

 Foreign diplomats and their families are immune from prosecution in their host country under the 1961 Vienna Convention.

It means that 23,000 people in the UK who hold this status cannot automatically be hauled before the courts if they commit a crime.

However, when an envoy or a relative is accused of a serious offence the Foreign Office will ask their home country to waive immunity.

Usually, immunity only covers diplomats and families based in London. However, a special deal is in place which gives it to diplomats and relatives based at RAF Croughton. American officials are said to have turned down the waiver request in Harry Dunn's case because the suspect's husband is a spy and they want to protect his identity.

It is understood US authorities told the accused woman to get on a plane. In the past, the Foreign Office has expelled diplomats suspected of serious crimes.

Last year it emerged that an attache accused of two rapes was thrown out of Britain because his country would not waive his immunity. Other allegations included sexual assault against a diplomat from Algeria, blackmail (Egypt) and possession of a firearm (Cambodia). 

'We are trying to get some closure - all we want is to meet her and ask her to come back. It is not much to ask. We are a family in complete ruin. We are utterly broken inside and out.

'We are utterly shocked and appalled that somebody is allowed just to get on a plane and go home and avoid our justice system'.

Harry's father Tim works at the school where Sacoolas' three children went for a few weeks before she fled, according to the Telegraph.

Mr Dunn says his son's alleged killer had admitted culpability and promised to stay in the UK.

Mr Dunn said: 'Our understanding is that she was compliant with police and admitted at the time she was in the wrong. We know from police she was going to stay in the country and committed to being here for three years. So to hear the news from police [that she fled] a few weeks after the funeral was devastating'. 

Mrs Sacoolas has been asked to comment but she has not returned to her original US address.

Asked if she had a message for Mrs Sacoolas, Ms Charles said: 'Just come home. Come back to us. Come back to the UK.

'We're not a horrible family. We're a usual UK family that just need to put a face to what we have now as a name.

'Talk to her, find out how she's feeling. She's got to be suffering as well - she's a mum.

'Without knowing who this person is properly, we can't begin to try and start our grieving process.'

Speaking of the lengths the family would go to have closure from the incident, Ms Charles said: 'If we have to we will go to Washington. We don't want it to have to come to that, we don't see why it should have to come to that... we just want to sit and talk with her.

'We just don't understand how you can just get on a plane and leave behind the devastation she has without even speaking to us or facing us, or an apology of any kind.'

The teenager's father Tim Dunn said: 'It's appalling. You can't have this precedent where just because you have this immunity you can do whatever.

'It's just

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