A shocked mother delivered her baby on the back seat of a car as her husband made a desperate dash to drive her to hospital.
Caroline Ford, 35, of Fairfield Avenue,Ruislip, delivered baby Freddie herself in the car park of Queen Charlotte's Hospital in East Acton.
And despite the couple's surname the car they were in at the time was actually made by rival manufacturer Vauxhall.
Mrs Ford said: "It was a bit of a shock - something for his autobiography if he ever becomes famous.
The expectant mum had felt contractions earlier in the day but was told to wait before travelling to hospital.
But en route a traffic incident on the A40 held the couple up, and the teacher felt a strong urge to push, which was followed by her waters breaking.
Mr Ford, 35, said: "She was on all fours on the back seat.
"I was calm at first but when I saw the head I panicked.
"I was beeping my horn and driving on the wrong side of the road."
Mr Ford dashed into the hospital, kicking off his flip flops and running barefoot through the wards.
But when he returned he found his wife cradling their newborn son.
Mrs Ford said: "He saw a little bit of an opening and he just shot out like a bullet.
"Everyone came sprinting back to the car.I said, 'you're a bit late.'
Despite his hurried arrival in the back of the Vauxhall, baby Freddie weighed 8lb 12oz and was allowed home two days later.
The couple along with their 18-month-old daughter Hollie are now settling down to family life.
Mrs Ford added: "I was thinking about my granny at the time and how she would have had her babies at home with no help.
"We're just lucky he was OK."