Natasha Groves has stopped walking down Central Parade for fear she might bump into the man who killed her daughter.

John Page was sentenced to eight months in jail after pleading guilty in July last year to death by careless driving.

The 36-year-old mowed down Lillian Groves as she was fetching a football outside her home on June 26, 2010.

He has since returned to the New Addington estate, and Mrs Groves has admitted she does not know what she will do if she comes across the man who threw her life into turmoil.

She said: “I don’t go up the parade anymore because there is always that issue.

“I don’t know what my reaction would be. I just don’t want to think about it.”

The 42-year-old is still angry he has returned to New Addington having already tainted the area for the family.

She said: “They say they are reintegrating him back into the estate.

“But I have lived here all my life. Why should we give up our home and move off the estate to make it more comfortable for him.

“I think the kids have been through enough without giving up their home life.”

The family are still haunted by that fateful day, coincidentally Natasha’s birthday.

She said: “He has no idea the pain he has caused.

“He has no idea how many people he has hurt by taking her away.”

The family have campaigned to introduce drug testing by the roadside to make sure drug drivers face tougher sentences.

And they hope the introduction will not just see law-breakers punished but act as a deterrent to others, minimising the chances of another tragedy for another family.

Michaela Groves, Lillian’s aunt, added: “We want zero tolerance.

“At the moment there is no deterrent. It’s a much bigger problem than they realise.”

Cannabis was found in Page's system, and there was a half smoked joint on the floor of the car, but there was not enough to charge him with a more serious charge of causing death by careless driving while under the influence of drugs, which carries a maximum 14-year sentence.

If Page had been tested at the roadside, enough cannabis may have been found to charge him with the more serious offence.

But, as the law stands, drug-testing equipment is used only in police stations, rather than at the roadside.

The Groves family have been campaigning ever since for Lillian’s Law to bring in roadside drug testing.

They have had meetings with Mike Penning, Parliamentary Under-Secretary of State for Transport, and went to Number 10 to chat to Prime Minister David Cameron.

But they are not letting up, with another petition drive beginning soon and Michaela, 45, writing to every MP in the House of Commons to get their support.

You can sign the petition here You can also get the latest on the campaign by following their Twitter account @lillianslaw1