A speeding driver who knocked down and killed a mum in front of her partner and 13-month-old daughter on Christmas Eve has been jailed for four years.

Uninsured Mohammed Tayyab Khan was driving his father's high-performance BMW 5 Series car at almost twice the 30mph limit when he overtook a slower moving vehicle on the approach to a pedestrian crossing in Manningham Lane, Bradford, and struck 23-year-old Leanne Egan.

Miss Egan had been walking to work with her partner Christopher Whincup and her daughter Sasha, who was in a pushchair. She died two days later in hospital after suffering massive injuries, including a fractured skull.

After stopping briefly at the scene Khan drove off in the badly damaged BMW, but Bradford Crown Court heard yesterday that within an hour of the collision he had parked up the car and handed himself in at a police station.

He claimed he had only been doing about 30mph at the time of the collision in 2005, but at a hearing in March the 25-year-old pleaded guilty to causing death by dangerous driving on the basis his speed was between 55 and 60mph.

Khan, 25, of Brantwood Road, Stoney Ridge, Bradford, yesterday also admitted failing to stop after the accident and using the BMW without insurance.

After the case, Leanne's mother, Kathleen Egan, welcomed the four-year sentence, but said it would never bring back her daughter.

She said: "We are satisfied with the sentence, though no jail term - even the maximum sentence of 14 years - would have been enough.

"We can never replace Leanne. We are left with her memories. We just hope he has this on his conscience."

The family's police liaison officer, PC Paul Patterson, said police were also satisfied with the sentence. He added: "We are pleased, from the family's point of view, that he entered a guilty plea.

"This was a clear example of an inexperienced driver driving in a vehicle that was clearly too powerful for him at excessive speed."

Prosecutor Christopher Batty told the court that Khan had received driving bans in the past under the "totting up" provisions and for driving while disqualified.

"The defendant was driving his father's 5 series BMW and he was not insured to drive it," said Mr Batty.

"It appears he had previously been insured in September 2005, but the insurance company saw him as too great a risk and in November 2005 they informed the defendant's father that they would no longer insure his son."

The court heard that Khan was unaware of the insurance company's decision and he still believed he was covered at the time of the accident.

Barrister Richard Gioserano, for Khan, said his client had swerved to try to avoid Miss Egan, but it was too late given the speed he was doing.

Khan, whose son was born in October 2005, was said to have panicked after the collision and Mr Gioserano said that was something he was not proud of.

"No doubt what he feels about this is nothing to compare with what Leanne Egan's family feel, but in his own way he has this to live with as well,'' said Mr Gioserano.

He said Khan was genuinely remorseful for effectively taking away someone's life through his own stupidity.

The Honorary Recorder of Bradford Judge Stephen Gullick told Khan he would be banned from driving from six years and would also have to pass an extended test.

"Those who seek to drive vehicles of this type at speed in these conditions must understand that if they cause the death of another individual they are likely to go to prison for a significant period of time,'' said Judge Gullick.