A giant blimp of London Mayor Sadiq Khan will be seen in the UK capital's skies this weekend after protesters were given permission to fly the crowdfunded balloon in Westminster.

More than 3,000 supporters have donated more than 58,000 (Rs 53 lakh) in total to fund the 29-foot balloon, which depicts the mayor reclining in a small yellow bikini.

Protest organiser Yanny Bruere, who describes himself as a British free speech advocate, said he had set up the crowdfunding campaign in response to London authorities' decision to allow a "Trump Baby" blimp to be flown during last month's visit to Britain by US President Donald Trump.