NHS junior doctors, teachers and steel workers will lead thousands of activists as they march on Trafalgar Square in protest against David Cameron and his government on 16 April. The demonstration will see speeches from top left-wing politicians, such as shadow chancellor John McDonnell and Unite chief Len McCuskey, as well as a video message of support from Labour leader Jeremy Corbyn.

The event has been organised by the People's Assembly, an anti-austerity group founded in 2013 which has the support of some of Britain's largest trade unions.

Sam Fairbairn, the national secretary of the People's Assembly, told IBTimes UK the protest will centre on health, homes, jobs and education. "When we launched the demonstration we had no idea what kind of spectacular failure the government would make on all four of those fronts in the last few weeks," he said.

Fairbairn noted the Tata Steel crisis, junior doctors' dispute, Panama Papers leak and backlash to the government's plan to turn all secondary schools in England into academies had galvanised the activists.

"We say that those four things (health, homes, jobs and education) any decent society would have, but this government is doing absolutely the opposite," he added. Fairbairn claimed he expected "tens of thousands" to attend the demonstration, while more than 5,000 people have signed up to the event's Facebook page.

However, getting an independent attendance figure on the day will be difficult since the Metropolitan Police do not divulge the information to the media. The protest will come a week after activists protested against Cameron outside Downing Street.

The demonstration, which was organised by IBTimes UK columnist Abi Wilkinson, followed Cameron's admission that he had profited from his late father's offshore investment fund. The prime minister sold £31,500 worth of shares in Blairmore Holdings in January 2010, months before being elected.

David Cameron admits having held stake in father\'s offshore trust IBTimes UK

The Conservative leader has seen his popularity plummet among the British electorate. A survey from YouGov, of more than 1,600 people between 6 and 7 April, showed that Cameron's net approval rating had dropped from -14 in February to -24, the lowest level since July 2013. But Labour leader Jeremy Corbyn has seen his popularity surge from -34 in February to -22 in April.