BORIS Johnson is being investigated by the Parliamentary Commissioner for Standards over a £15,000 holiday in the Caribbean.

The Prime Minister vacationed in Mustique, a private island in the archipelago nation of St Vincent and the Grenadines, with Carrie Symonds shortly after his General Election victory in 2019.

Sky News reports that there is confusion over when Johnson declared the holiday in the register of MPs' interests.

Parliamentary commissioner for standards Kathryn Stone, who has powers to trigger suspensions of MPs or even by-elections if serious breaches are found to have occurred, revealed she is looking into the funding of the trip.

Downing Street has previously said "all relevant transparency requirements" were met around the holiday.

Johnson said he had accepted "accommodation for a private holiday for my partner and me, value £15,000", citing Conservative donor David Ross as the provider.

However, a spokesman for Ross – the co-founder of Carphone Warehouse – later denied the claims.

Reacting to the claims, Labour deputy leader Angela Rayner told Sky News: "Another day, another investigation into Boris Johnson for more sleaze and dodgy dealings.

"The public have a right to know who paid for Boris Johnson's luxury Caribbean holiday and the renovation of his flat.

"Most importantly, we need to know what these donors were promised or expected in return for their generosity.

"As we have seen over the last year, Tory donors have received a very high return on their investment in the form of government contracts.

"Boris Johnson needs to stop using the office of Prime Minister as an opportunity to fund his lavish lifestyle and enrich his mates."