Nottinghamshire Police is currently investigating whether the law was broken during a by-election campaign.
In March, a by-election in Wollaton West was fought after the former Conservative leader Georgina Culley passed away.
It was won by Labour’s Cate Woodward, who is now one of three councillors serving the ward.
Due to the ongoing investigation, police are unable to give details of exactly who is being investigated but a spokeswoman for the force confirmed it was ‘making enquiries into allegations made under the Representation of the People Act’.
No individuals have been accused of wrongdoing, and no arrests have been made.
Towards the end of the campaign, insults flew and several accusations were made.
One of the main issues during the campaign was Robin Hood Energy (RHE), the energy company owned by the Labour-run Nottingham City Council.
The chairman of Robin Hood Energy is Councillor Steve Battlemuch, who is also a Labour councillor for the ward.
One of the leaflets sent out by the Conservatives during the campaign accused RHE of being a ‘failing company’.
RHE then sent out a letter to every resident in the ward ‘defending itself’.
The Conservatives claim this was an attempt by RHE to ‘interfere’ in the election.
But Labour have said the firm was simply defending itself against a smear.
After the election, which was narrowly won by Labour, it emerged that RHE had failed to declare to Companies House a £7.5 million investment from the city council within the one-month period allowed.
The investment was made before the election, but was declared to Companies House six months later – five months after the legal deadline.
The company says this was a simple administrative error, but the Conservatives have said this was an attempt to conceal the information while the by-election was happening.
Companies House acknowledged that the rules had been broken, but said it will not be taking any further action.
Councillor Steve Battlemuch said: “I don’t know what the allegations are but I would be happy to cooperate with it (the investigation).
“As far as I’m concerned it was a free and fair election, and people are entitled to make their views on things known robustly.
“They (The Conservatives) made a number of allegations that were unfounded.
“I think Robin Hood Energy was right to defend itself and its reputation. It’s a company with a lot of customers in Nottinghamshire and they (Conservatives) were saying a lot of things that were inaccurate.”
“They were being smeared, so I think they were right to defend themselves.
“I don’t think the £7.5 million is anything to do with the by-election at all, as far as I understand, someone forgot to send a form on a particular day, and it’s now been registered by Companies House who aren’t taking further action, so I don’t think that’s got anything to do with it.”
But councillor Jim Armstrong, who also represents Wollaton West said the late £7.5 million declaration was ‘definitely political.’
He said: “It was a very dirty campaign and the company supported the Labour group in the by-election.
“Steve (Battlemuch) was going round telling everyone that RHE was a profitable company and it was going to make a profit by the end of the month.
“Without that £7.5 million, they would have struggled to make a profit, but they couldn’t declare it during the by-election so they waited months to do it and hoped we wouldn’t notice.”
“The £7.5 million was definitely for political reasons.”
A spokesman for Robin Hood Energy said: “We do not have any comment to make at this stage, but will of course cooperate with any enquiry when and if it’s appropriate to do so”.
They have previously denied knowingly filing the document late, and said it was an ‘administrative oversight’.
William Scott is the deputy chairman of Nottingham Conservatives, and said that the council had a history of hiding facts they found uncomfortable.
He said: “The Labour-run council has been forced to publicly admit that Robin Hood Energy had broken the rules by not notifying Companies House, before the Wollaton by election, of the millions of pounds of council tax payers money given to it interest free to prop up Labour’s pet political project.”
“The council may have called it a “technical breach”, but it was at very least, a politically convenient offence as it enabled Labour’s by-election claim – that Robin Hood Energy was not failing – to go unchallenged.
“Labour waited until after the election before admitting that instead of paying back its loans as originally promised, Robin Hood Energy had been given another £9m to add to the £11m already sunk into it.”
A spokeswoman for Nottinghamshire Police said: “We’re making enquiries in to allegations made under the Representation of the People Act in relation to an election that took place this year.”
Labour’s Cate Woodward, who won the by-election, said: “Nobody has approached me about it, and I don’t really know what the investigation is about, so I can’t really comment on it.”
A spokesman for Companies House said they could not comment on individual cases.