Tracy Ayling KC led the prosecution case against Brooks, who remained absent while also acting as his own legal representation.
The situation was explained by Judge Pepperall to the jury, when he warned them not to take the defendant's absence as any sign of guilt.
Evidence was then heard in the usual way, but on 11 March the judge said he had received a letter from Brooks, who was being held at HMP Bedford, in which he further objected to the trial continuing without him.
A three-page response gave short shrift to Brooks's latest protests.
"Dr Brooks cannot refuse to engage with both the court and his lawyers, and then complain that he was not properly kept updated as to his case," he said.
The trial continued, and on 24 March Stephen Leslie KC was brought in to cross-examine Mr Perks - a measure made to provide balance to the prosecution case.
On 25 March, a new five-page ruling was made to allow Brooks to appear via video-link from prison should he so wish, rather than go in person.
In the ruling, the judge spoke of Brooks's "sporadic" engagement.
"On no fewer than 13 occasions, he has declined to attend court, sometimes even when only required to appear by prison link, without good reason," he said.
Addressing the behaviour of the defendant, the judge added: "Dr Brooks has deliberately made himself ill in order to seek to manipulate the court process and prevent his trial from proceeding. Such conduct was the voluntary decision of a well-informed medical man with capacity."
Following the ruling, the defendant continued to complain about his condition and the trial, and after assessment from doctors confirmed he was fit to attend but remained absent through his own choice, the prosecution case concluded.