What does junkie Pete Doherty have to do to get sent to prison?

But serial offender Pete Doherty was spared jail yet again yesterday and given four weeks to prove he has kicked his drug habit.

The 28-year-old singer, who is charged with possession of crack, heroin, cannabis and ketamine, was warned he would be sent to prison if he failed to stay clean.

Clearly exasperated by the Babyshambles frontman, Judge Davinder Lachher, who was due to sentence him yesterday after already delaying the decision for a month, said: "It is a community order or prison. If he does not show the motivation in four weeks, it will be prison."

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Doherty's extensive criminal record includes assault, possession of a flickknife and numerous driving and drug offences. Given a month from July 4 to enter drug rehabilitation, Doherty only entered a private £ 3,000 five - day programme on July 23.

Meanwhile, last week pictures were printed in a tabloid newspaper of him smoking a crack pipe.

West London magistrates heard yesterday that Doherty, Kate Moss's former boyfriend, had a 12-month implant inserted in his stomach to wean him off heroin during the detox programme.

The detox is so recent that subsequent tests showed traces of drugs still in his system.

Judge Lachher said: "Anyone can do it for a week. I don't know to what extent he is motivated to continue. Can I make it very clear that it is either a community order or custodial. I expect him to comply with that."

Doherty's mother Jackie was present in court despite causing a rift between the two by publishing a tell-all book about her son. His father Peter Doherty, an Army officer, did not attend.

His supermodel ex-girlfriend was on holiday in Marbella with friends. The couple broke up after Miss Moss, 33, discovered he had cheated on her.

Despite protests from Sean Curran, Doherty's solicitor, the rocker was banned from living in London under his new bail conditions.

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It was agreed he will stay in Somerset - apart from when performing in Portugal for three days - and continue with his drug treatment programme until his sentencing on September 4. It is believed he will be staying with friends.

The cocky singer infuriated the judge by walking away before she had finished delivering the final details of his bail conditions. One of his entourage shouted from the public gallery: "Stop showing off."

Doherty was originally arrested on May 5 for drug possession and for driving his Jaguar in West London without insurance or an MOT certificate.

At the July court appearance he arrived two and a half hours late to find a warrant had been issued for his arrest two minutes earlier.

As he left court yesterday, wearing his signature trilby and black suit, he said: "I'm banned from London. I can't stay with my Mum because my Dad's there."

He stood up through the car's sunroof and waved, kissed goodbye and made hand signals to journalists and photographers as he was driven away.

Judges have been criticised for giving Doherty sympathetic hearings in the past. In April, district judge Jane McIvor gave him a £770 fine and a four-month driving ban after he drove under the influence of drugs without a licence. She also claimed to be a fan of his music.