The trial of Australian entertainer Rolf Harris has been adjourned for several days, just as it was drawing to a close, after his defence barrister became unwell.

Harris is charged with indecently assaulting four girls in the UK between 1968 and 1986. He denies all 12 counts.

Sonia Woodley QC had been due to make her closing speech at London's Southwark Crown Court on Wednesday (local time) but was too unwell.

"Unhappily the position is she is unwell and not able to make her speech this afternoon," Justice Nigel Sweeney told the jury.

The judge sent the jurors home until Monday but said he could not guarantee Ms Woodley would be better by then.

Prosecutor Sasha Wass QC made her closing speech on Tuesday after five weeks of evidence, painting a scathing picture of Harris.

She urged the jury to find the entertainer guilty on the basis that 10 alleged victims had given "chillingly similar accounts".

Ms Wass said indecent assault cases often relied on the word of one alleged victim against a perpetrator but with Harris many women had described his "deviant sexual behaviour".

"In this case it's the word of 10 independent victims, all who have given chillingly similar accounts of sexual abuse and exploitation by a man whose public image was pristine and lilywhite," Ms Wass said.

The main complainant in the sex abuse trial is a childhood friend of Harris's daughter, Bindi.

She says the artist and singer first abused her when, aged 13, she joined the family on an overseas holiday in 1978.

The alleged victim went to the UK police in November 2012.

After the defence's closing speech Justice Sweeney will sum up the case before he asks the jury to retire and consider its verdict.

ABC/AAP