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A former pop star is facing a police probe after being accused of ‘mindless vandalism’ for defacing a UKIP election billboard with grey paint.

Ex-KLF frontman Bill Drummond said he had been “morally and aesthetically” offended by the advert in Birmingham.

The musician turned artist donned a pair of white overalls and covered the entire poster with his own brand of paint, so that only the word “grey” – his graffiti tag – could be read.

Writing about the stunt in the Birmingham Post, Drummond, who had a No.1 hit with The Timelords, said: “By the time you read this I may have been arrested.”

UKIP confirmed it is making a formal complaint to police and the party put up a new replacement poster at the site.

West Midlands spokesman Bill Etheridge said: “We don’t find it humorous, we don’t think it is valid comment. We are not impressed.

“We are reporting it to police and hope they will take appropriate action, to the full extent of the law, to deter other people from such mindless vandalism.

“If someone wants to argue or disagree with us they should use their own resources and do it in the democratic way.”

The European election advert targeted claimed British workers were being “hit hard by unlimited cheap labour”.

But the former pop star said it offended him in “so many ways”, adding it was “very cynically trying to pander to us at our most vulnerable and negative and not to our better selves”.

Drummond added: “This billboard not only offended me morally and aesthetically, it also went against everything that I feel political discourse should be about.”

The Birmingham-based artist said he had 1,000 litres of paint made up a decade ago so those who bought it could deface “anything you found to be morally or aesthetically offensive”.

“Basically I was in the business of promoting vandalism,” he admitted.

He said he planned to paint over a Birmingham billboard during a three-month exhibition of his work, being held at Digbeth-based Eastside Projects until June.

“I had in mind a billboard advertising one of the big chain of bookies or one for the modern crop of lone shark companies,” he wrote.

“But when I started to work in Birmingham, I was almost disappointed to find there were no current billboard campaigns for these companies, thus nothing to truly offend me.

“That was until last week.”

Drummond and fellow KLF musician Jimmy Cauty went to No.1 in 1991 with Doctorin’ The Tardis, under the name of The Timelords.

They famously burned £1 million – the bulk of their earnings – on the Scottish island of Jura in August 1994.

The pair said they wanted to create artwork with the cash but struggled to attract interest.

Drummond reportedly said that burning the money “seemed the most powerful thing to do”.

West Midlands Police said no complaint had yet been made when contacted today.