Defence lawyer Hamidul Haq, who is acting for former Singapore Civil Defence Force chief Peter Lim Sin Pang, said that his client has not indicated if he plans to appeal against the guilty verdict.

He added that they would have to go back and read the grounds of judgment before deciding on the "appropriate course of action".

Lim, who received oral sex from the general manager of a vendor, was found guilty of corruption on Friday afternoon.

In a scathing judgment delivered by District Judge Hamidah Ibrahim, the court found that there was "no doubt" Lim was the initiator of the oral sex, and that he was "obviously corrupt".

Judge Hamidah said that Lim had been repeatedly evasive when asked if he knew that Ms Pang Chor Mui was the general manager of Nimrod, an active SCDF vendor, at the time of the oral sex. She added that it was unbelievable that a high-ranking civil servant like Lim did not know that he was in a situation of an "obvious conflict of interest", which he never declared.

"He must have made a wrong career choice for the last 25 years," she said, adding that Lim's credibility on the stand had been impeached and his testimony found "seriously questionable".

The judge also said it was clear the act was not a culmination of a close personal friendship as Lim claimed, as they lost contact for over a decade and scarcely met even after they reconnected following his promotion to SCDF chief.

Lim's statements that he had agreed to oral sex out of pity and despite feeling no sexual attraction to Ms Pang were also unbelievable, said the judge.

She commented that Lim could have ended such an "ordeal" easily, and it was hard to believe that he was so "magnanimous" as to be "a lamb led to slaughter" by Ms Pang. The prosecution will make submissions on sentencing and the defence on mitigation on June 7.