Independent Tauranga MP Brendan Horan is not concerned about a possible police investigation into allegations he took money from his late mother's estate.

The former NZ First MP was this week cleared of any wrongdoing by an investigation undertaken by accountants for the executor of the estate, John Buckthought.

Brendan Horan is not worried if a police case is launched into allegations over his mother's estate.

Other media say police are assessing the case after NZ First leader Winston Peters laid a complaint with the Serious Fraud Office.

Inspector Karl Wright St Clair today confirmed Tauranga police have received a complaint regarding Brendan Horan MP. It is currently being assessed.

'It's not being investigated its being assessed,” says Karl. 'We will have to assign someone and they will have to spend some time assessing it and then we will know more.”

He doesn't yet know how long the assessment will take.

The party leader's complaint to the SFO, laid in November 2013, stated there was a 'very serious case of potential fraud involving a sitting Member of Parliament”.

That complaint was referred from the SFO to police as the amount involved was less than the $2million threshold, reports Fairfax Media.

Brendan says his former leader's complaint to the SFO is just 'filthy, disgusting politics.”

'They are not interested and they passed it on to the police. The police have to act on any complaint that they are given.

'Winston's trying to drag my family through the mud for another year or so, and just using my dead mother. It's beyond despicable and I won't have it.

'The police have to spend their time fighting real crime. So he knows these things take a long time that's what I mean, him trying to drag things out.”

Brendan's tried to call police himself – to encourage them to do a thorough job so the New Zealand public will see for themselves.

Brendan was kicked out of the NZ First party last November by Winston when the allegations he took money from his mother Olwen Horan first came to light.

Brendan's since continued in Parliament as an independent MP and is now talking about a coalition of independent MPs whose first duty will be to their electorates. The coalition will agree to govern on confidence and supply, but on all other issues members can vote as their respective electorates wish.

It strikes at the power base of the minor parties, and Winston's leadership style in NZ First is already driving people away, says Brendan.

'People from New Zealand First have crossed over to supporting me. He's leaking support left, right and centre.

'I know that within NZ First there are many disgruntled people and for many of them that was the final straw - not standing a candidate in Christchurch.”

NZ First's decision not to have a candidate stand in last year's Christchurch by-election sent a clear message the party doesn't care about the South Island, says Brendan.

After the last NZ First conference he also had people calling saying they had ‘had it' with NZ First, says Brendan.

'His message was ‘We are going to cause an early election'. Now in some countries you would be put in jail for that. It's not constructive, it's not helping New Zealand, and that's his statement. Pull the government down and have an early election, and it's just ridiculous. New Zealanders are more mature now.”

In August 2008 when Winston Peters was Foreign Minister for the Clark Government, he was himself ‘stood aside' while the SFO investigated claims over a $100,000 donation from businessman Owen Glenn.