The co-star was later revealed to be Eryn Jean Norvill,who played King Lear's daughter Cordelia. Ms Norvill did not cooperate with the newspaper before the stories were published and initially did not agree to give evidence for the publisher in court.

Tom Blackburn,SC,acting for Nationwide News,told the court last week that Witness X would give"vitally important evidence,Your Honour might think,"that could assist in resolving"a difficult factual dispute".

But Justice Wigney said the evidence proposed to be given by Ms X was largely irrelevant to the focus of the newspaper's articles,which concerned Mr Rush's alleged conduct during King Lear.

Justice Wigney said Ms X worked"with or alongside"Mr Rush some years before King Lear and initially refused to assist theTelegraph,but changed her mind after seeing media reports of the case.

On October 26,Arnold Bloch Leibler partner Leon Zwier,who also acts for Ms Norvill,indicated to theTelegraph that Ms X may be willing to give evidence.

Contrary to submissions made by Mr Rush's legal team,Justice Wigney said he was not satisfied Ms X or her solicitor had engaged in an abuse of process or contempt of court by allegedly putting"improper pressure"on Mr Rush during a conversation with his solicitor.

Justice Wigney said the incidents about which Ms X was expected to give evidence were"all said to have occurred during the season of a particular theatre production,"mostly in a social setting outside the production,and could be said to be sexual in nature.

He said the alleged conduct,which did not occur during the performance or rehearsals,included electronic messages.

Justice Wigney said the proposed new evidence,at its "very highest",would only have been potentially relevant to a small number of general imputations Mr Rush claimed were conveyed by theTelegraph's articles,including that he was a"pervert"and engaged in"scandalously inappropriate"behaviour in the theatre.

The bulk of the allegedly defamatory claims pleaded by Mr Rush related to the STC production ofKing Lear,he said.

He said an argument that the evidence proposed to be given by Witness X might amount to"tendency evidence"- which would require an allegation Mr Rush had a tendency to behave in a particular way - was"not developed"by Nationwide News.

Justice Wigney noted the torturous procedural history of the proceedings,including repeated amendments by the Telegraph to its defence. By contrast,Mr Rush's claim had been"consistent since the day it was filed"in December 2017 and"there have been no amendments by him".

At every stage Mr Rush had pressed for an early hearing of his case while theTelegraph and its reporter Jonathon Moran,who is also being sued,had"frustrated and impeded"that"at every turn,"Justice Wigney said.

He said that his observations of Mr Rush and his wife Jane Menelaus during the case was that it had exacted a"great emotional toll on them"and it was reasonable to infer they would suffer continued stress and anxiety if the amendments were permitted and the trial was adjourned for six months.

Ms Norvill gave evidence last week that Mr Rush"deliberately"groped her on the side of her right breast during a preview performance in late 2015 when King Lear grieved over Cordelia's corpse.

She also alleges Mr Rush made lewd gestures during rehearsals such as"cupping"her breasts above her body,along with sexually suggestive comments. Mr Rush denied the claims.

Mr Rush was supported in court by the production's director,Neil Armfield,and his co-stars Robyn Nevin and Helen Buday.

But actor Mark Leonard Winter,who played the role of Edgar in King Lear,gave evidence he witnessed Mr Rush performing a"Three Stooges-y"style sketch above Ms Norvill's body during rehearsals which included a"boob-squeezing gesture".

He said he also witnessed Mr Rush"cupping"Ms Norvill's breast on stage,but said it was the left side of her body. Ms Norvill has given evidence Mr Rush touched her on the side of her right breast.

The parties will start delivering their closing addresses to Justice Wigney on Wednesday.