It's big, it's orange and it's wearing a nappy. And now the blimp depicting US President Donald Trump as a baby with an iPhone in hand has permission from the Mayor of London to fly over Parliament Square Garden when the US leader visits London next week.

On Thursday, a spokesman for Mayor Sadiq Khan confirmed to The Washington Post that his office had granted permission for the blimp to take off, saying in an email that Khan "supports the right to peaceful protest and understands that this can take many different forms".

The spokesman added that the activists flying the blimp "will also need to receive the necessary approvals from the Metropolitan Police and National Air Traffic Service in order for it to fly".