Peter Murrell resigned just after his wife left office, after admitting that the party had been claiming to have 100,000 members when membership had plunged to 70,000.
New Scottish First Minister Humza Yousaf will challenge UK over gender law veto
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“Clearly it would not be appropriate to comment on any live police investigation but the SNP have been cooperating fully with this investigation and will continue to do so," the party said in a statement released after the arrest.
Husband of ex-Scottish leader Nicola Sturgeon arrested: Report
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