The agency - hailed as Britain's FBI - last night confirmed obtaining an asset-freezing order on the property in Golders Green, North London , which has been the Siddiq clan's main home for 14 years.
Former Labour Minister Tulip Siddiq faces an Interpol Red Notice for her arrest and extradition if she fails to attend a court hearing in Bangladesh this month over corruption charges.
Lawyers for Siddiq said the charges against Tulip Siddiq were “politically motivated” and “completely false,” and that Dhaka has provided no evidence to support its claims.
The country's Anti-Corruption Commission confirmed it is liaising with 'multiple countries' over investigations into the family of former prime minister, Sheikh Hasina.
Detectives from the National Crime Agency were told at last month's meeting that Bangladeshi authorities have amassed new evidence against the Labour MP.
Ms Siddiq resigned as Treasury Minister this month after she and family members were accused of siphoning off £3.9billion from Bangladesh through her aunt, the country's ousted prime minister.
Last night, the Treasury refused to rule out a further assault on pension savings after Torsten Bell was handed the job in a mini-reshuffle triggered by the resignation of City minister Tulip Siddiq.