Former deputy prime minister Sir Oliver Dowden has become the most senior ally of Rishi Sunak to be interviewed in the official investigation into betting on the date of the general election, Sky News understands.

He follows Mr Sunak’s former parliamentary aide Craig Williams and former Downing Street chief of staff Liam Booth-Smith in being questioned by the Gambling Commission, the statutory body that regulates betting in the UK.

Mr Sunak has not yet been interviewed, Sky News understands, though “numerous people” including Conservative Party officials have been.

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A source close to Sir Oliver said the former senior cabinet minister is not and was never under investigation himself.

It is understood Sir Oliver spoke to the police to assist with their inquiries as part of their investigation into others. This is said to have taken place in early summertime and the officers involved were part of the Gambling Commission.

The inquiry – launched in June – is set to continue for another three to six months.

News of Sir Oliver’s interview, along with the seizing of “hundreds of documents” from Tory HQ by the commission, has emerged on the day the Conservative Party Conference opened in Birmingham.

Ironically, the Gambling Commission’s head office, on the fourth floor of Victoria Square House, Victoria Square, Birmingham, is just a half-mile, 10-minute walk from the ICC, where the Tory conference is taking place.

Sir Oliver was knighted and Mr Booth-Smith was awarded a peerage in the former prime minister’s dissolution honours, announced less than an hour before the polls closed on 4 July.

The commission is investigating whether bets were placed on a July election by people with inside knowledge – in breach of gambling rules – in the days leading up to Mr Sunak’s shock announcement of the election date on 22 May.

A source told Sky News: “The general election betting investigation is still ongoing. Hundreds of documents have been seized by the Gambling Commission from CCHQ.

“The Gambling Commission has also employed more ex-police as investigators to take the case forward. It’s expected the case will continue for three to six months.”

Asked if Mr Sunak has been interviewed, the source said: “I don’t believe so. Numerous people have been interviewed, in and out of CCHQ.

“Gambling Commission investigators have made numerous visits to CCHQ. Oliver Dowden was interviewed.”

What is the election betting scandal?

The election date betting scandal began in June when Craig Williams, formerly MP for Montgomeryshire and Mr Sunak’s parliamentary private secretary, admitted he was being investigated by the Gambling Commission.

Mr Williams had placed a £100 bet on a July election at Ladbrokes in his constituency just days before Mr Sunak announced on 22 May that the election would be held on 4 July. Based on odds at the time, he would have won £500.

“I put a flutter on the General Election some weeks ago,” he said in a post on X on 13 June. “This has resulted in some routine inquiries and I confirm I will fully co-operate with these.

“I don’t want it to be a distraction from the campaign. I should have thought through how it looks.”

Mr Williams, who admitted he had made a “huge error”, was dropped by the Tories as their candidate in the new seat of Montgomeryshire and Glyndwr but remained on the ballot paper, but was defeated, coming third behind Labour and Reform UK.

As the Gambling Commission proceeded, Tony Lee, the party’s director of campaigns, and his wife Laura Saunders, who was Tory candidate for Bristol North West, were placed under investigation.

In a statement on the day news of the investigation was first reported, Saunders said she would be “cooperating with the Gambling Commission”, while Lee took a leave of absence from his role.

Then Nick Mason, the party’s chief data officer, became the fourth Conservative candidate or official to be investigated. He took a leave of absence and denied any wrongdoing.

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In a bizarre twist, a Labour candidate in the election, Kevin Craig, was then suspended by his party after betting against himself and the Gambling Commission launched an investigation into him.

Mr Craig, candidate in Central Suffolk and North Ipswich, posted on X that he had “enjoyed the odd bet for fun” throughout his life.

“A few weeks ago when I thought I would never win this seat I put a bet on the Tories to win here with the intention of giving any winnings to local charities,” he said.

“While I did not place this bet with any prior knowledge of the outcome, this was a huge mistake, for which I apologise unreservedly.”

Then on 27 June Sky News revealed that Mr Booth-Smith, then Mr Sunak’s most senior adviser in Downing Street, had been interviewed by senior Gambling Commission officials and questioned about who knew about the timing of the election.

Sources emphasised, however, that Mr Booth-Smith was not a suspect and was interviewed as a witness and was “asked for help”.

Sky News has approached Mr Dowden and the Conservative Party for comment.

Fresh weather warnings have been issued for heavy rain, with some areas already saturated by earlier downpours to be hit.

Parts of the country saw more than the monthly average rainfall on Monday, while some counties in southern and central England have already had more than 250% of their September average, according to the Met Office.

Yellow weather warnings for wind and rain came into force on Sunday, while two fresh yellow warnings have been issued for heavy rain next week.

Sunday’s warning, meaning further heavy rain is likely to cause some travel delays and flooding, covers much of southern England and South Wales between 4pm on Sunday and 9am on Monday.

Between 20mm to 30mm of rainfall could be seen over nine to 12 hours, with up to 80mm in some localised places on higher ground.

The Environment Agency has issued 33 flood warnings, indicating flooding is expected, and 67 flood alerts, where flooding is possible, in place across England on Sunday afternoon.

Mark Garratt, flood risk manager at the Environment Agency, said rain expected on Sunday and Monday will bring a risk of surface water flooding in large parts of the southwest and southern England, spreading up into the Midlands, and on Monday, flooding in parts of Leicestershire is also possible.

He said: “It is especially important that people do not drive through flood water – it is often deeper than it looks and just 30cm of flowing water is enough to float your car.

“Across the country, Environment Agency teams have been out checking flood defences and clearing any debris from storm drains and are also supporting local authorities in responding to surface water flooding.

“The advice to the public to keep checking their flood risk, and search ‘check for flooding’ and to sign up for free flood warnings on the latest situation or follow @EnvAgency on X for the latest flood updates.”

Check latest weather forecast where you are

A yellow warning for wind is in place across southwest England and Wales between 9am on Sunday until the end of the day.

Gusts of between 50mph and 60mph could be seen, with large waves, trees brought down, travel disruption and some power cuts.

Fresh rain warnings issued

Rain warnings cover eastern England between 8am on Monday and 3am on Tuesday, and North Wales and northwest England between 12.30am and 8pm on Monday.

Both forecast between 20mm and 40mm of rainfall widely, with 60mm possible in a few places across North Wales and northwest England and between 60mm to 80mm in some areas in eastern England.

Met Office meteorologist Liam Eslick said they are expecting some “pretty heavy persistent rain” across North Wales and northwest England.

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The higher ground in eastern England will see the most rainfall. Areas including Northamptonshire and Bedfordshire will see less rainfall, but are already saturated by recent heavy rain.

It comes after areas across England suffered heavy rain and localised flooding in recent days, with commuters facing widespread disruption on road and rail services.

About 650 properties were flooded in Bedfordshire, Northamptonshire and the home counties, according to the Environment Agency, which estimated around 8,200 properties had been protected.

By Tuesday night, higher pressure will move in, meaning a drier, sunnier spell, Mr Eslick said.

“Come Tuesday night into Wednesday we’re starting to see higher pressure, so turning a lot drier and plenty of sunny spells,” he said.

“But the following weekend, it does look like there’s a further low pressure coming in, but we’re still keeping an eye on that.”

Robert Jenrick has defended being handed a £75,000 donation from a company which had received money from a firm registered in the British Virgin Islands (BVI), despite criticising Labour over the freebies row.

Questions have been raised over the ultimate source of the funds from The Spott Fitness, which gave Mr Jenrick three separate £25,000 donations in July.

As first reported by Tortoise Media, the company received a loan from a firm based in the BVI.

The Tory leadership contender told Sunday Morning With Trevor Phillips that The Spott Fitness “as I understand it… is a fitness company that operates in the UK”, and the donation was “perfectly legal and valid”.

Politics Live: Tory leadership candidates faced questions on Sky News

Mr Jenrick spoke to Sky News alongside the three other rivals to replace Rishi Sunak, as the Conservative Party Conference in Birmingham kicks off.

During the interviews, Kemi Badenoch said she is a fighter and if someone takes a swing at her “I will swing back”.

Meanwhile, Tom Tugendhat defended his “posh boy public school background”, saying his military service has given him leadership skills, while former home secretary James Cleverly refused to name any of the previous four Tory prime ministers as being to blame for the party’s general election defeat, saying the public “don’t like infighting”.

Jenrick says donations ‘valid’

Asked about the donations from The Spott Fitness, which have been declared on his MPs’ register of interests, Mr Jenrick said: “As I understand it, this is a fitness company that operates in the UK.

“It’s a perfectly legal and valid donation under British law and we’ve set it out in the public domain in the way that one does with donations.”

Pressed for details on who owns the company and who works for it, the former immigration minister said this would be set out “on Companies House in the normal way” and he has “obviously met people who are involved in the company”.

“What people are criticising Labour for is actually rather different,” he added.

“Labour are being criticised for their rank hypocrisy that they spent years complaining about other political parties and then they’ve chosen to take off donors and cronies and to give passes to Number 10 in response.”

The Labour Party Conference in Liverpool last week was overshadowed by a donation and freebies row, after it emerged Sir Keir Starmer accepted over £100,000 in gifts since 2019.

Questions have been raised in particular over the large amount given by Labour peer and TV executive Lord Alli, who had a pass to Number 10 for a short time in order to attend meetings, the government said.

The Conservatives are now gathering in Birmingham since their worst defeat at the ballot box in history at the July general election.

Jenrick backs ‘cast iron cap’ on migration

Mr Jenrick, currently the frontrunner to replace Mr Sunak, said his party made “serious mistakes” and failed to deliver.

He is pitching himself as a “change” candidate, telling Trevor Phillips he would take the UK out of the European Convention on Human Rights (EHCR) in order to get the failed £700m Rwanda asylum scheme up and running, and introduce a cap on migration.

He said this would be different from previous commitments to introduce a limit as the cap would be “legally binding… cast in iron”, with the number set “in the tens of thousands or lower”.

Badenoch: ‘If you swing at me I will swing back’

Mr Jenrick faces competition on the right from Kemi Badenoch, the former equalities minister.

Speaking to Phillips, she defended an Op-ed in The Daily Telegraph in which she claimed there was a rise in the number of migrants coming to the UK who “hate Israel”.

She said she was not referring to all Muslim immigrants “but there are some, those who buy into Islamist ideology, political Islam, they do not like Israel and we need to be able to distinguish between the two”.

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The combative shadow housing secretary also insisted she does not go looking for fights when asked about her rows with the likes of Doctor Who star David Tennant, but that she will stand up for herself.

The North West Essex MP said: “I will not stand there and let people punch me. If you swing at me I will swing back but I don’t look for fights.”

She added: “I am something that is just different and unique and that is why I stand out in this contest.”

‘Public don’t like bickering’

All four leadership contenders will make their case at the party conference this week, before another round of voting by MPs will reduce them to the final two, which the party membership will then vote on.

Mr Cleverly, who got the least votes of those remaining in the previous round, said his various cabinet roles in the past few years meant he has spent “more time promoting other people’s ideas” rather than his own – but that shows he is a “team player”.

He declined to name a prime minister who he blamed most for the party’s 2024 defeat but added: “I’ll tell you what the public told me they didn’t like – they didn’t like the constant infighting, they didn’t like the bickering.”

Mr Tugendhat asked the public to judge him on his own record, rather than his public schooling.

“I think that decisions I have made for the last 35 years demonstrate the character that you are looking at,” he said.

“I have chosen consistently to serve our country. I have put myself on the frontline in Iraq and Afghanistan.”