From Wiki:
https://en.wikipedia.org/wiki/Fred_West#Investigation
The final witnesses to testify at Rose's trial was Fred's appointed appropriate adult, Janet Leach, whom the prosecution had called to testify on 7 November in
rebuttal to the tape recordings of Fred's confession which had been played to the court on 3 November and in which he had stressed Rose had "known nothing at all" about any of the murders.
[191] Leach testified that through this role, Fred had gradually begun to view her as a
confidante, and had confided in her that on the evening prior to his 25 February arrest, he and Rose had formed a
pact whereby he would take full responsibility for all the murders, many of which he had privately described to her as being "some of Rose's mistakes". He had further divulged that Rose had indeed murdered Charmaine while he had been incarcerated, and had also murdered Shirley Robinson. Fred had also confided that although he had actually dismembered the victims, Rose had participated in the mutilation and dismemberment of Shirley Robinson, and had personally removed Robinson's unborn child from her womb after her death. In reference to the remaining eight murders for which Rose was charged, Leach testified that Fred had confided Rose had "played a major part" in these murders.
[192]
Upon cross examination, Leach did concede to Richard Ferguson she had earlier
lied under oath about having sold her story to a national newspaper for £100,000, although she was adamant as to the sincerity of her testimony. While delivering this testimony, Mrs. Leach collapsed, and the trial was
adjourned for six days. Nonetheless, she would return to complete her cross examination on 13 November.
[193]
This is consistant with the TV programme.