Taking a cue from Iceland, thousands of Brits swarmed London’s streets on Saturday to try to get their leader to quit.

Drummed up via Facebook and other social media, the protest called on David Cameron to “close tax loopholes or resign” as the U.K.’s prime minister, in the face of the Panama Papers revelations.

The dress code was “Panama” — liberally interpreted as Hawaiian shirts and straw hats, according to reports — but the theme of the day was “pig”. The porky piñata and porcine face masks on parade suggest it’ll be a while before Cameron’s opponents let him forget “Pig Gate.”

Still, in true British fashion, it was more decorous than a similar march in Iceland, where citizens showed their displeasure by throwing eggs and pots of thick local yoghurt at parliament.

That protest helped prompt the departure of Iceland’s prime minister, Sigmundur David Gunnlaugsson. He was the first national leader to quit over a mention in the Panama Papers, millions of leaked documents showing who has parked their wealth in offshore tax havens.

After the protest, bookmaker Paddy Power put the odds of Cameron’s being the next to step down over the leaks at 4-1 — making him favorite. Argentina’s President Mauricio Macri is also in the betting, at around 8-1, as is Ukranian leader Petro Poroshenko, whose odds have recently fallen to the same level.

Read:Bookmakers set odds for next leader to resign after Panama Papers mention

Earlier last week, Cameron’s odds were much further out, at 20-1. But they shortened after Cameron tried, and failed, to shrug off a persistent media grilling over the Panama Papers.

At the start of last week, he said his tax affairs were a private matter. Then he said his family did not and would not in the future benefit from Panama-like tax arrangements. On Thursday, he admitted he had benefited from an offshore fund his father, now dead, had set up.

“Well, it’s not been a great week,” Cameron said on Saturday at a meeting of members of his Conservative Party, The Wall Street Journal reported.

“I know that I should have handled this better, I could have handled this better. I know there are lessons to learn and I will learn them,” he added.

On Sunday, the British leader released some of his income tax filings in a bid to douse the media flames. But that didn’t stop new questions being fired at Cameron over his finances, this time about a gift of £200,000 ($282,586) in cash from his mother.

On Monday, Cameron appeared in parliament for the first time since the Panama Papers emerged. Speaking to the House of Commons, he defended his late father’s offshore investments, saying this was “standard practice and not designed to avoid tax,” the BBC reported.