Stormzy has turned down an invite to play at Jeremy Corbyn's Glastonbury-style music festival, it has been claimed.

The grime star is a fan of the Labour leader and led the crowds in a chorus of 'Oh, Jeremy Corbyn' when he performed at Glastonbury last year.

Party bosses had asked him to perform at Labour Live - a day-long festival in north London next month - with Labour insiders believing his star billing could help save the struggling event.

But in a fresh blow to the festival - dubbed 'Labour Dive' by party staff because of the low ticket sales - he turned down the offer.

It comes after MailOnline revealed Labour could face losses of up to £600,000 as they have only sold a fraction of the tickets up for grabs.

Tickets to the festival cost £35 and the line up includes Magic Numbers, Rae Morris and Reverend and the Makers.

Stormzy (pictured with Jeremy Corbyn last year at the GQ awards) has turned down an invite to play at Jeremy Corbyn's Glastonbury-style music festival, it has been claimed.

Jeremy Corbyn (pictured at Glastonbury last year) is a fan of Stormzy and hoped he would perform at the festival. But without the grime musician's star appeal, the festival is struggling to sell tickets

While shadow chancellor John McDonnell, Guardian columnist and left-wing activist Owen Jones, and Mr Corbyn are all billed to speak.

How the costs of the Labour Live festival break down MailOnline has analysed what costs might be involved in putting on the event. Here is how they break down. Hire of venue of over 10,000: £250,000 Haringey Council Booking fee: £6,300 Haringey Council application fee: £126 Haringey Council set up / set down days: £6,250 Haringey Council environmental impact fee: £10,400 Estimated cost of hiring stages, sound system, security etc: Up to £400,000 Advertisement

A Labour source told The Sunday Times: 'Stormzy wanted to do it but couldn't. He felt bad but was already committed elsewhere.

'That would have saved it. Still, we should have foreseen this. Mass movements have to be grassroots and structureless.

'You need a groundswell — that's the beauty of Momentum. It's local, it's random and it has this unpredictable energy.

'You can't demand that thousands of people turn up and listen to people they read online every day anyway.'

It was reported last week that just 1,800 of the 20,000 tickets available for the festival have been sold.

And MailOnline revealed the party faces losses of £600,000 unless it manages to hurry up and sell the tickets.

Laying on such a large one day festival - including hiring the site, security, stage and music systems - costs an estimated £673,076, according to analysis by MailOnline.

Even if all the tickets sold went at the full price, Labour has so far only taken £63,000 for the festival, leaving them facing a loss of of £610,076.

So far just 1,800 of the 20,000 tickets have been sold, even through the £35 passes - which have a £5 discount for the unemployed - have been on sale for nearly two months.

Party bosses have launched a last-minute publicity blitz to sell tickets to the festival, which is at White Hart Lane Rec in Tottenham, north London, on June 16.

Labour launched a last-minute publicity blitz to sell tickets to the festival, which is at White Hart Lane Rec in Tottenham, north London, on June 16.

They have been sending out a pleading email to Labour MPs to plug the event on their Twitter accounts.

Labour MPs including Tracy Brabin and Eleanor Smith have both posted about the festival in recent days and urged their followers 'not to miss out' and 'make sure you are there'.