Tulip Siddiq, daughter of Sheikh Rehana and niece of Sheikh Hasina, is being investigated by United Kingdom’s parliamentary standards watchdog over evading rental income on a London property.

Tulip Siddiq, an economic secretary to Treasury and Labour MP for Hampstead and Highgate, is under investigation for the late registration of interests, according to Parliamentary Standards Commissioner's website.

"Tulip will cooperate fully with the Parliamentary Commissioner on Standards on this matter," said a Labour Party spokesperson. Tulip is is the first MP of the new Parliament to be placed under investigation by the Standards Commissioner.

Labour had previously told the Daily Mail that the failure to register the income was an ‘administrative oversight’. Investigations into three former MPs which began during the last Parliament remain open.

Former Conservative MP Bob Stewart is being investigated for failing to declare an interest and an alleged lack of cooperation with the watchdog's inquiry.

Ex-Tory MP Andrew Bridgen is being investigated over registration of his interests, while former Tory Sir Conor Burns is being investigated for use of information received in confidence.

During last Parliament, Standards Commissioner opened more than 100 probe into MPs, majority of which were resolved by ‘rectification’ - a procedure that allows MPs to correct minor breaches of Commons rules.