British PM Boris Johnson faces parliamentary investigation into £15,000 holiday on Mustique

The Commons sleaze watchdog has been urged to investigate Boris Johnson’s luxury Caribbean holiday, as it emerged that he may have taken advantage of a timeshare-style arrangement.

Labour has now formally asked the parliamentary commissioner for standards to get to the bottom of who paid for the prime minister’s £15,000 break on the island of Mustique.

A spokesperson for David Ross – declared on the register of members’ interests as having covered the £15,000 cost – initially denied the wealthy businessman had paid for it. But the spokesperson later said Ross had “facilitated accommodation” and “therefore ... Mr Johnson’s declaration to the House of Commons is correct.”

A government source suggested that the businessman had been due to occupy the villa on the island of Mustique but then agreed to make it available for their 10-day stay.

An investigation is expected to begin in the coming days.