The first sitting MP to be jailed in three decades will continue to receive her taxpayer-funded salary behind bars, and Parliament is powerless to oust her.

Fiona Onasanya, a former Labour whip, was sentenced at the Old Bailey on Tuesday to three months in prison after being convicted for lying to police officers to avoid a speeding fine.

The Peterborough MP, who was caught speeding less than two months after being elected in 2017, has been urged to resign by the Labour Party but has indicated that she will continue serving from prison.

A source close to the 35-year-old, who was expelled by Labour last year, told The Telegraph that she had allegedly made no contingency plans for being jailed, adding they believed she was intent on staying on.

Her lawyer, Christine Agnew QC, told the court that Ms Onasanya had chosen not to resign because her £78,000 salary was “her only source of income”.

It means that Ms Onasanya will continue earning a weekly salary of £1,480 and receive pension contributions amounting to £9,000 annually whilst incarcerated.

She will also be entitled to claim thousands of pounds in expenses, including her £625 monthly rent, staff wages and the running of her constituency office.