Labour seeks inquiry into Boris Johnson and credit facility guaranteed by cousin

Boris Johnson is believed to have found it difficult to live on his prime ministerial salary of £164,000 a year. Photograph: Matt Dunham/AP

Labour is calling for an investigation into an alleged arrangement by which Boris Johnson used a relative to act as a guarantor for an £800,000 credit facility when he was prime minister.

The party has written to the parliamentary standards commissioner after the Sunday Times reported Canadian businessman Sam Blyth, a distant cousin, had agreed to act as a guarantor for a credit facility for Johnson.