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POLICE are investigating another SNP MP over financial dealings.

Dundee West MP Chris Law was detained and questioned in his home city yesterday.

The investigation is focused on Law’s Spirit of Independence referendum campaign, where he toured Scotland in a refurbished Green Goddess fire engine in the run-up to the 2014 vote.

Another of the SNP’s huge new intake of MPs, Natalie McGarry, was charged with embezzlement less than 24 hours before Law was questioned.

And Edinburgh Western MP Michelle Thomson is still suspended from the party as police investigate property deals carried out for her by a solicitor struck off for misconduct.

Law was not charged with any offences yesterday.

Police said: “A 46-year-old man was detained and has been released pending further inquiries.

“Investigations are continuing.”

A source close to Law told us: “Chris attended the police station on Wednesday morning and provided information in relation to a matter under investigation.

“He has agreed to provide the police with further information and is confident the matter will be resolved.”

Law briefly returned to his home in the west end of Dundee last night.

But he turned his 4x4 in the drive, spinning his wheels, and drove off again as our reporter tried to get him to stop and speak.

A woman had arrived seconds before him in a green vintage sports car.

When we arrived, there was a brass plate next to the doorbell which said “Law” and “mortgage services”. It was later removed.

An Aston Martin racing car with the number 007 was parked beside the house. The 46-year-old MP is a “petrolhead” and vintage bike and car enthusiast.

(Image: PA)

Law has said he set up Spirit of Independence to reach voters who said they were not getting enough information about the campaign.

He travelled around Scotland in his blue-painted fire engine and claimed to have handed out two tons of leaflets and raised £30,000.

Law is a colourful character who got a social anthropology degree, trained as a chef, organised motorbike tours in the Himalayas and worked as a financial adviser before entering Parliament.

He, McGarry and Thomson were all elected in the incredible SNP “surge” after the referendum, which saw the party claim 56 of Scotland’s 59 Westminster seats.

But the SNP Westminster group has been beset by scandals since, and the inquiry involving Law is another headache for party leader Nicola Sturgeon.

Glasgow East MP McGarry was charged on Tuesday after a 10-month police investigation into tens of thousands of pounds allegedly missing from Women for Independence, a campaign group she helped found.

She faces allegations of embezzlement of funds, breach of trust and offences under the Scottish Referendum Act 2013. She has denied any wrongdoing.

McGarry resigned the party whip when the claims against her emerged and was suspended from the SNP.

Her arrest, and the charges she now faces, have raised the prospect of a by-election in her seat, one of the key election battlegrounds in 2015.

Women for Independence were founded in 2012 to promote female voices in the referendum debate.

The group’s national committee identified an apparent discrepancy between their income and spending in November last year, and alerted police. It’s understood there is no link between the McGarry and Law inquiries.