The release of the Sam Uffindell bullying inquiry findings on the same day as Queen Elizabeth II's funeral is "pretty disrespectful" and "pretty cynical", Deputy Prime Minister Grant Robertson says.

Robertson slammed the timing of the release - but National Party leader Chris Luxon earlier said he wanted it made public as soon as possible. He had received the report on Thursday night, and taken the time on Friday to consider it.

Luxon said media had been asking for some time when it would be released.

Robertson also said media would no doubt expect the executive summary of the report into Uffindell would also be released - so far only National has given a press conference and advised what Maria Dew KC had found.

He said assault and bullying allegations needed to be taken seriously.

Robertson said consistency was important for policy issues, referring to National's position on law and order given Uffindell's past.

Robertson said when Dew investigated issues within the Labour Party an executive summary was released. He said the same should be expected of National.

'Thorough investigation did not substantiate any allegations of bullying'

A report into allegations against Sam Uffindell has exonerated the new Tauranga MP - and he has been reinstated to the National Party caucus.

An independent report by Maria Dew KC has found that allegations against Uffindell about his behaviour as a university student towards a female flatmate in Dunedin were not as reported in the media - there were differing accounts and the allegations could not be substantiated.

The independent inquiry was ordered after the woman had spoken to RNZ, following Uffindell's own, earlier admission that he had been a bully at Kings College in Auckland.

Uffindell had told the National Party selection panel of his behaviour at King College before they selected him to be National's Tauranga candidate - although party leader Christopher Luxon was not advised.

Dew's investigation did not substantiate any allegations of bullying outside of Uffindell's time at King's College, the National Party said today.

Luxon had asked Dew to look into allegations about Uffindell's behaviour at university and any further incidents that were brought to her attention.

National Party president Sylvia Wood said the Dew investigation would not be released but the inquiry had taken place between August 15 and September 15. Fourteen people were interviewed in the investigation and there were written statements.

In a statement today, Luxon summarised Dew's findings:

* He said the "thorough investigation did not substantiate any allegations of bullying outside Mr Uffindell's time at King's College";

* "Regarding the alleged Otago University flat incident, there are differing accounts of what occurred and Ms Dew concluded the event was not as it was described in the media. Despite this conclusion, it is clear that the complainant's experience in a deteriorating flat relationship caused her harm";

* "Aside from his time at King's College, and interactions with his flatmate at university, no one else came forward who considered themselves a victim of Mr Uffindell's behaviour".

"The investigation has found there are differing accounts of an incident that happened 20 years ago in the context of a student flat that was breaking up," said Luxon. "Mr Uffindell has acknowledged that things were said that he now realises his flatmate overheard, which he regrets.

"Mr Uffindell has also publicly acknowledged that he was a bully at King's College and that this behaviour harmed a number of people, for which he has apologised.

"With the known matters having now been independently considered, and with Mr Uffindell's own acknowledgement that he is a different person now to the person he once was, we are now able to move forward."

The National Party caucus decided this morning to reinstate Uffindell. Luxon said he believed in second chances and forgiveness. "Mr Uffindell is looking forward to working hard for the people of Tauranga. I am confident he can and will do that."

Nobody else came forward who considered themselves a victim of Uffindell's behaviour, but Luxon said he wanted to acknowledge people had been hurt.