A LETHAL dose of morphine which killed a 17-year-old girl who had become addicted to drugs has landed a Marlow singer-songwriter with an eight year prison sentence.

Jack Alderton got fiancée Georgina Boxall addicted to class A drugs when she was just 15 years old - described as "calculated and destructive" by the judge who jailed him.

The 25-year-old had twice been served with child abduction notices by police forcing him to stay away from Miss Boxall, who he supplied with drugs over a two year period.

Jurors at Reading Crown Court had been told Alderton would not let his girlfriend, from Farnham, Surrey, wean herself off the drugs she had been abusing since meeting him.

In a text message sent shortly before her death on March 16 last year, Miss Boxall said: "I just want you to have a convo with me occasionally without it being about drugs."

Alderton, of Harwood Road, Marlow, had previously admitted five drug-related offences but had denied supplying the class A drug - illegally obtained morphine sulphate - that killed Miss Boxall.

But in an extraordinary blog post on the eve of his trial Alderton said he was "lucky" not to have been charged his fiancée's manslaughter He was convicted of the offence by jurors and jailed for a total of eight years by Judge Angela Morris.

Passing sentence she told Alderton: "The text messages suggest she was trying to rid herself of the addiction to drugs by going cold turkey.

"There was no guarantee she would have succeeded - however, you did nothing to help that. In fact, you put drugs in her way.

"Your actions were simply improper, calculated and destructive because you knew only too well the danger Georgina Boxall was in by agreeing to the morphine use."

Miss Boxall's parents, Leslie and Susan, had twice secured child abduction notices for Alderton to stay away from their daughter in the two years before her death, the court heard.

Jurors were told Alderton would use money from his disability benefits to buy substances from internet sites, as well as from street dealers, which he would give to Miss Boxall. He would also make money from dealing drugs himself, the court heard.

The pair met while Alderton was studying in Surrey and they got engaged.

Miss Boxall took the fatal dose of morphine at the home of Damien Stone, one of Alderton's suppliers, and passed out unconscious in a child's bed. She died in an air ambulance on the way to hospital.

Stone, 44, of Crowthorne, Berkshire, was jailed for three years after pleading guilty to supplying class A drugs.

Alderton had admitted one count of supplying ecstasy, a class A drug, three days before Miss Boxall's death, two counts of supplying class B drugs diazepam and cannabis, and two counts of supplying Class C drugs subutex and tamazepam.