The doctor had to be airlifted to hospital after being seen to drive straight into the path of a car driven by retired engineer Colin Kay, who captured the footage on his SmartWitness system.

Both vehicles were completely written off after the 50mph smash on the A586 Great Eccleston bypass at St Michael's on Wyre in Lancashire.

The doctor initially denied liability but, according to Mr Kay, later changed her story. But, SmartWitness says the foreign medic escaped any police action because the police officer investigating the case went off sick and the paperwork was not prepared in time.

Miraculously, she was not badly hurt despite being cut out of her Toyota Aygo and taken to Preston Royal Infirmary by helicopter.

Mr Kay, 72, was unhurt and his wife Krysia, 72, who was travelling with him in their Citroen Picasso, suffered a whiplash injury to her shoulder.

Mr Kay released the footage after learning the doctor had escaped prosecution. 

SmartWitness sales director Mark Berry said: "This accident perfectly shows the value of our cameras. You have a collision where one driver is very clearly at fault but initially is disputing liability.

"The camera never lies and we were able to show conclusively who was to blame."