Bail guarantors for WikiLeaks founder Julian Assange have been ordered by a UK court to pay up around $150,000 for failure to ensure the surrender of the controversial whistleblower, who jumped bail June this year to seek refuge on Ecuador's embassy in London.

The amount due was downgraded from the original sureties of about $225,000 because the court recognised that the supporter of Mr Assange had acted in "good faith," about the matter.

"I accept that they trusted Mr Assange to surrender himself as required. I accept that they followed the proceedings and made necessary arrangements to remain in contact with him," Westminster Chief Magistrate Howard Riddle was reported by BBC as saying on Tuesday in the court ruling.

Judge Riddle noted, however, that guarantors of the Aussie national "failed in their basic duty, to ensure his surrender. They must have understood the risk and the concerns of the courts."

"Both this court and the High Court assessed that there were substantial grounds to believe the defendant would abscond, and that the risk could only be met by stringent conditions including the sureties," the court decision added.

Judge Riddle set Nov 6 as deadline for payment of the bond.

Despite the fine, the court lauded the supporters of Mr Assange, led by prominent businessman Vaughan Smith, for admirably sticking to "their beliefs and principles throughout . . . in what is sometimes considered to be a selfish age."

Earlier, Mr Vaughn argued before the court that his colleagues - among them an Australian journalist, two members of the British aristocracy and a Nobel laureate - should not be made to pay for what they believed was right.

"We believe we have done the right thing and have no regrets for having supported Julian Assange," Mr Vaughn was reported by News Ltd as saying last week.

Mr Assange has been holed in Ecuador's embassy since June following his decision to seek asylum from the Latin American country, claiming that U.S. British and Swedish authorities have been conspiring to pressure him with legal cases that in the end would see him tried before an American court.

London has been working to send the Aussie citizen to Sweden to face charges of sexual assaults, cases that Mr Assange said were mere pretext for Washington to get a hold on him.

The U.S. government, he added, has been planning to collar him to face charges of espionage and sedition, stemming from WikiLeaks' decision in 2010 to publish confidential U.S documents obtained by the anti-secrecy site.

Ecuador had granted Mr Assange asylum in August, supporting his assertion that he could face death or life imprisonment in U.S. soil. But the former hacker could not avail of the protection as British officials vowed to arrest him as soon as he steps out of Ecuador's diplomatic compound.