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Activists have hijacked ad boards across the capital and plastered them with fake election posters mocking the Conservatives.

Adverts suggesting Theresa May’s “plan for Britain” includes nuclear apocalypse have appeared at bus stops and on the Tube as campaigning ahead of the June 8th poll enters its final week.

Posters attack senior Conservative figures as well as Mrs May. One shows a picture of health secretary Jeremy Hunt next to a “slogan” reading: “My plan for the NHS: Let it rot.”

Another, spotted on the London Underground, pictures the Prime Minister holding hands with Donald Trump beside the claim: “Theresa May would follow Donald Trump to the end of the world. Vote for a nuclear suicide-pact.”

Activists from the Special Patrol Group - which specialise in subversive advertising, or “subtervising” – are said to be behind the campaign.

But the posters are based on designs by satirical artist Darren Cullen. He told the Standard "cruel and irrational austerity policies" had inspired him to produce the posters, and added "appreciated" the effort of activists without condoning their behaviour.

The 34-year-old from Lewisham said: "I couldn't say what impact it will have, I just felt like I had to do something.

"The NHS cannot survive another Tory government, and this is the first time in my life where we have an option to move away from the backwards ideology of Thatcherism towards a more modern social democracy, run for the benefit of everyone - not just the super-rich."

His strongly-worded attacks have gained attention on social media, with many Londoners tweeting approving messages about the campaign.

The Metropolitan Police said no criminal offences had been committed.

Transport for London, which manages the ad boards, said: "This is not an authorised advertising campaign. It's fly-posting and an act of vandalism. We take this extremely seriously and have directed our contractors to remove them immediately."

The Conservative Party did not respond to requests for comment.

Mock advertising campaigns are fairly commonplace in London. Earlier this year, a fake Navy recruitment drive urging applicants to “become a suicide bomber” appeared at bus stops around the city. The posters were again designed by artist Darren Cullen.

And three years ago, fake adverts accusing police in London of racism were torn down in a similar incident.