A businesswoman who was over the drink drive limit when she lost control of her speeding car, killing a young Lincolnshire couple, has been jailed for more than seven years.

Mary Butres, 48, reached speeds of 113mph in her high-performance Jaguar XJ8 saloon before hitting standing water and aquaplaning as she returned from a day at the races.

The vehicle ploughed into Mark Compton, 20, and his 19 year-old girlfriend Jodie Brown as they walked away from their broken down car on the A1 near Grantham.

The helpless couple, who were in the central reservation, were hit with such force they were hurled onto the opposite carriageway.

They were killed instantly but Butres and her passenger John Nichols, 58, who owned the car, escaped unhurt, Nottingham Crown Court was told.

The 4.2 litre silver Jaguar's "black box" data recorder revealed Butres was travelling at 113mph, despite bad weather that had left the road covered in puddles.

Later back-calculation of her blood-alcohol level also showed she had been almost one and a half times the legal limit at the time of the crash.

Yesterday Butres, of St Mary's Street, Stamford, showed no emotion as she was jailed for a total of seven and half years after admitting causing death by dangerous driving.

Nichols, her business partner and lover of Manor Road, Carlby, had earlier been found guilty of the same offences because he had failed to tell her to slow down. He will be sentenced later.

Mr Crompton, a council worker and Miss Brown, both of Swinstead, were returning home from a gym when they broke down on the A1 at Great Ponton, near Grantham.

In an impact statement read to the court the mothers of the victims, Beverley Crompton and Ethel Brown, said : "Our families have been completely devastated.

"Mark and Jodie were a young couple just starting out on their future together but everything was taken away. It continues to devastate us."

Butres had originally denied causing death by dangerous driving but was convicted in October 2008 .

She later successfully appealed against the conviction but before a retrial last year she changed her pleas to guilty.