Siobhan Prigent, 34, sold project support services to the NHS through her company

The hard-Left protester who was filmed screaming 'Nazi scum' at a Donald Trump supporter doused in milkshake has quit her job as an NHS contractor.

Siobhan Prigent was filmed swearing and shouting in the face of a semi-retired grandfather at a demonstration in London's Parliament Square on Tuesday.

The 34-year-old, who lives in the capital, was also spotted laughing as the British Trump supporter, who has not been named, was attacked by the angry mob.

Her behaviour was described as an 'outrage' in a petition set up on Change.org by Jason Coleman, which attracted 1,700 signatures in 20 hours.

She had a contract which paid her taxpayers' money to provide clinical trial coordination at University College London Hospitals NHS Foundation Trust, through her profit-making company VLEK Ltd.

Miss Prigent was seen swearing and shouting in the face of a semi-retired grandfather at a demonstration against the visit of Donald Trump at Parliament Square in London on Tuesday

But a UCLH spokesman told MailOnline today: 'Ms Prigent has today informed us that she will no longer be working at UCLH because she does not want us or the NHS to suffer any more negative attention.

'She had been at UCLH for a week. As an NHS trust, we pride ourselves on treating our patients and colleagues with kindness and compassion in all that we do.'

The trust added that Miss Prigent had been working for a third party contracted to carry out administrative work at UCLH, and that her work there did not involve patient contact and was not funded by the NHS.

Mr Coleman had said: 'She should not be allowed to hold onto her NHS job as this behaviour is not in line with NHS Professional Standards expected by its employees.

'Her apology is totally fake as if this incident hadn't have been captured on video she would not be making the apologies she has done since and would no doubt do it again.

'Sacking her will show that the NHS will not tolerate such behaviour from its employees and serve as a deterrent to others who think this behaviour is acceptable.'

A separate petition on the same website by a Richard Yaxley attracted more than 1,200 signatures in a day.

On Tuesday, Miss Prigent was questioned about her shocking behaviour, responding: 'I don't need to hear from other white men, thank you very much.'

Her behaviour was described as an 'outrage' in a petition set up on Change.org by Jason Coleman, which attracted 1,700 signatures in 20 hours

The revelation yesterday that Miss Prigent was an NHS contractor came amid Mr Trump's suggestion that the NHS would be on the table in any post-Brexit trade talks.

Miss Prigent describes herself online as an 'intersectional feminist' and a 'crazy cat lady' with an interest in mental health

Miss Prigent describes herself online as an 'intersectional feminist' and a 'crazy cat lady' with an interest in mental health.

She appeared to have gone to ground last night as she could not be reached for comment and had deleted all her social media accounts.

Before deleting the accounts, however, she apologised for her actions.

'I am very sorry for my behaviour today. I should have protested peacefully and I didn't, and I regret that,' she posted on Twitter.

'I've let myself down and I do understand that fully. There are two sides to every story, but my actions were my own, and that's on me. Please leave my family and friends out of it.'

But her apology was questioned as it came just hours after she had posted expletive-filled messages about Trump supporters.

Miss Prigent (pictured in the fracas on Tuesday) apologised in a now-deleted tweet: 'I am very sorry for my behaviour. I should have protested peacefully and I didn't, and I regret that

She had earlier tweeted: 'The MAGA [make America great again] c**** get a police escort #NoThanksNazis #TogetherAgainstTrump #DumpTrump.'

An internet user commented that the post made her apology seem 'empty'.

The middle-aged Trump supporter was led away by police for his own protection after the fracas.

The man later said he was peacefully debating with 'moderate Lefties' and 'having a laugh with the majority of them' before the demonstration turned violent.

He said: 'We have to put forward how aggressive the Left can be – it's not us. If they want to call me Right-wing because I'm supporting Trump then I must be Right wing, but I'm not a racist.'

The man also claimed demonstrators kicked him in the legs, attacked him with a banner and attempted to remove his Make America Great Again hat.

Moments after the middle-aged man was doused in milkshake, Miss Prigent was filmed yelling 'he's a f****** Nazi'.

The foul-mouthed protester has worked for the NHS for ten years and set up her own management consultancy business last September.

Miss Prigent, 34, is the only director of VLEK Ltd which has been awarded NHS contracts

She is the only director of VLEK Ltd which has been awarded NHS contracts.

Miss Prigent's LinkedIn account, which has now been deleted, stated that she worked for UCLH as a consultant.

The profile reportedly said: 'I have worked in clinical trials since 2009, starting in the NHS then moving in to industry in 2015.'

UCLH insisted that she was not their employee. She has also worked for Imperial College Healthcare NHS Trust as a clinical trial coordinator.

The pro-Trump supporter caught the milkshake before throwing it back during the protest

It is not clear what specific area of health care she works in but in one post she said she was interested in 'cancer research opportunities'.

One image showed her posing with a handwritten placard reading: '#whywedoresearch to make patient's treatment as individual as their cancer.'

Older photographs also emerged of her posing with a host of celebrities including actors Benedict Cumberbatch and Anthony Head.

A deleted Facebook profile image showed her grabbing the chest of a female friend. In her 'biography' on the site she wrote: 'Trying to educate myself.'

The pro-Trump supporter was escorted away by police for his safety on Tuesday afternoon

She also has a tattoo of Groot, a tree-like superhero from the Marvel comics, tattooed on her arm.

Miss Prigent, who was born in Oxford, is the sister of a former police officer who is married to a Royal Marine.

Alecia Emerson-Thomas, 38, has recently given interviews about her husband Peter's battle with post-traumatic stress disorder, which was triggered by his horrific experiences in Afghanistan.

Miss Prigent could not be reached for comment and her parents refused to comment.