by Felicity Collier

SELF-STYLED “richest plumber in the world” Charlie Mullins has sparked a storm of protest for putting up a giant anti-Corbyn banner, having recently been caught out for his dodgy employment practices.

The rogue boss and Conservative Party donor, who runs Vauxhall-based Pimlico Plumbers, has covered his company HQ with the poison pen slogan: “Don’t Flush Britain Down a 70s Sewer. Vote ‘No’ To Comrade Corbyn.”

Alongside the shallow sloganeering appears to be a Roman Knight sat on a toilet which he covers with a Union Jack shield as he faces an irate looking Mr Corbyn.

Corbyn supporters were quick to point out Mr Mullins’s less than sterling record as a modern employer.

A photo of the banner which quickly went viral was posted by critic Richard Donelly, who noted: “Pimlico Plumbers forces its employees into bogus self-employment status to deny them sick pay and holidays.

“The vested interests are going to come out fighting for the Tories.”

Earlier this year the firm faced an employment tribunal and employment appeal tribunal (EAT), which ruled that employee Gary Smith qualified as a worker at the firm despite his bogus self-employed status.

EAT said that Pimlico Plumbers could be using dodgy employment practices to avoid PAYE income tax scheme and employer’s national insurance contributions.

Labour List reported at the time that the tax revenue lost due to the firm’s practices would total £4 billion a year.

The Labour grassroots network said: “When will this incompetent Tory government live up to their promise to protect the rights of ordinary people by enforcing the law properly? The answer is never.”

It added that the Tories’ “silence in the case of Pimlico Plumbers speaks volumes.”

Mr Mullins posted on Facebook last Friday: “We pinned our colours to our metaphorical mast with the installation of our giant, 30-metre contribution to the general election.

“It’s the second time we’ve called our railway-facing billboard into political service and hopefully this time the message will be successful (the first was for the Remain campaign).”