Magistrates heard that Cpl Sian Kerry Galvin (pictured) was so drunk that she was unable to produce her pass at RAF Coningsby

A poster girl for the RAF who tried driving four times over the alcohol limit onto one of the UK's tightest military bases has walked free from court.

Magistrates were told mechanical engineer Sian Kerry Galvin, 36, would lose her job if she was jailed.

Boston Magistrates' Court, in Lincolnshire, heard that she was so drunk that she was not capable of producing her pass at RAF Coningsby — home to Britain's fleet of Typhoon fighters.

Military Police called civilian police officers who arrested Cpl Galvin after she failed a breath test.

In 2015 an RAF recruitment feature appeared on Twitter and Facebook featuring Cpl Galvin.

The 36-year-old also appeared in military brochure.

She was quoted as saying: 'I would say the RAF has made me far more independent and now I have friends all over the world.'

Daven Naghen, defending, told the court was told that alcohol abuse had been 'creeping up on her' for five years and that a string of personal issues had caused this year to be particularly difficult.

In 2015 the 36-year-old appeared in an RAF recruitment feature on Facebook and Twitter as well as in a military brochure

The court was told that alcohol abuse had been creeping up on Galvin for five years and that this year had been a particularly difficult one for her

Galvin has not drunk alcohol since her arrest.

Galvin, of Kirkby-in-Ashfield, Nottinghamshire, admitted drink driving and was fined £1,000.

She was given a 29-month ban from driving which can be reduced to 29 weeks through a rehabilitation course.

The court was told Galvin will face additional punishment for bringing the RAF into disrepute.