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Labour's deputy leader Tom Watson has demanded that the party publishes its submission to an inquiry into anti-Semitism allegations.

In a letter to Labour's general secretary, he said the response to the UK's equality watchdog had been "withheld" from the party's executive.

In reply, Jenny Formby said she had offered Mr Watson the chance to view the document.

She accused Mr Watson of "traducing" her reputation.

Earlier, Mr Watson also criticised the way the party responded to claims on the BBC's Panorama about its handling of anti-Semitism cases.

Speaking to the programme, which aired on Wednesday, ex-party officials claimed senior Labour figures had interfered in the disciplinary process of dealing with accusations of anti-Semitism.

Labour has insisted the claims were inaccurate and made by "disaffected" former staff.

Mr Watson said the party's response had failed those who spoke to the programme and "breached all common standards of decency".

"The way that they have been smeared, including by Labour spokespeople, is deplorable," he wrote.

But in her own letter, Ms Formby said Mr Watson had tried to "denigrate" progress within the party over handling anti-Semitism allegations.

She acknowledged that anti-Semitism was a "real problem" within Labour, but said the speed of processing cases has increased by more than four-fold since she became general secretary.

"By choosing to ignore the steps taken by this party, and commenting so uncritically about the Panorama programme, you are complicit in creating a perception that anti-Semitism is more prevalent in the Labour Party than wider society," she added.

"I did watch the Panorama programme, and I was very concerned to hear for the first time the distress suffered by some of our former staff members. To be clear, we were not made aware of these issues at the time."

Labour figures 'interfered' in anti-Semitism cases

In his letter, Mr Watson said Ms Formby had "insisted" members of the shadow cabinet should not have the right to see the EHRC submission, but added: "I disagree."

"Only sunlight can disinfect Labour of anti-Semitism now," he wrote.

But shadow home secretary Diane Abbott, a close ally of Labour leader Jeremy Corbyn, tweeted that Mr Watson knew "perfectly well that he cannot make 'demands' of Jennie Formby".

She added that he was "very wrong to imply that she is dealing with this matter with anything less than her usual professionalism".

Skip Twitter post by @HackneyAbbott .@tom_watson knows perfectly well that he cannot make “demands” of Jennie Formby. She is only answerable to @UKLabour NEC. And very wrong to imply that she is dealing with this matter with anything less than her usual professionalism @JennieGenSec https://t.co/pCwOF1su2C — Diane Abbott MP (@HackneyAbbott) July 11, 2019 Report

The EHRC launched a formal investigation in May into whether Labour had "unlawfully discriminated against, harassed or victimised people because they are Jewish".

The Jewish Labour Movement said on Thursday that more than 30 whistleblowers, including current Labour staff, would submit evidence to the inquiry.

Panorama claims

Labour's disputes team is supposed to operate independently from the party's political structures, including the leader's office.

BBC Panorama spoke to former party officials, who alleged they had to deal with a huge increase in anti-Semitism complaints since Mr Corbyn became Labour leader in 2015.

Some of the staff spoke to the programme despite having signed non-disclosure agreements (NDAs) when they left.

Eight former officials who worked in the team and dealt with anti-Semitism cases claimed to the BBC that:

The leader's office was "angry and obstructive" when it came to the issue

Officials brought in by the party's general secretary, Jennie Formby, "overruled" some of their disciplinary decisions and "downgraded" punishments to a "slap on the wrist"

Seumas Milne, one of Mr Corbyn's closest aides, laughed when advised by a long-serving party official about what Mr Corbyn should do to tackle anti-Semitism in the party

On one occasion, Mr Corbyn's office ordered batches of anti-Semitism complaints to be brought to his Commons office for processing by his aides

Labour has rejected claims of interference and described the programme as "seriously inaccurate" and "politically one-sided".

Shadow chancellor John McDonnell - a close ally of Mr Corbyn - said current staff had put in complaints to the BBC about the accusations made in the Panorama programme.

"I have always said from the very beginning [the process of dealing with complaints] was too slow and not ruthless enough, but it has improved dramatically now," he said.

Media playback is unsupported on your device Media caption John McDonnell says Labour's complaints process has 'improved dramatically'

"I think it is important that we listen to what has been said and look ourselves at what is happening, but what we've got now is two groups of staff challenging the accuracy of [the accusations] so we will have to look at that."

But Labour's shadow women and equalities minister Dawn Butler - who is a supporter of Mr Corbyn - said the party "must acknowledge the deep hurt caused to our Jewish brothers and sisters".

Skip Twitter post by @DawnButlerBrent I watched the BBC’s panorama programme last night and was saddened, we must acknowledge the deep hurt caused to our Jewish brothers and sisters by anti-Semitism within the Labour family. We must build bridges and fight racism together.#Panorama pic.twitter.com/tJsCo8IWtC — Dawn Butler MP✊🏾 (@DawnButlerBrent) July 11, 2019 Report

Labour has been engulfed in a long-running dispute over anti-Semitism within its ranks, which has led nine MPs and three peers to leave the party.

The leadership has been accused of failing to get to grips with the problem, with allegations of hundreds of complaints against members remaining unresolved.

But Labour said it "completely" rejected any claims it was anti-Semitic.

It accused the Panorama programme of being a "seriously inaccurate, politically one-sided polemic, which breached basic journalistic standards, invented quotes and edited emails to change their meaning".

The party said that "no proper and serious attempt was made to understand our current procedures for dealing with anti-Semitism, which is clearly essential to reach a fair and balanced judgement".

It added: "We will build on the improvements to our procedures made under Jennie Formby, and continue to act against this repugnant form of racism."