Jeremy Corbyn was a hit at Glastonbury but there has been a lot less enthusiasm for Labour’s own event

Labour’s live music event next month, dubbed Jezfest, is heading for losses of more than £1 million, according to party insiders.

Poor ticket sales for the event, which has failed to attract top-tier acts, are causing consternation among Jeremy Corbyn’s team with less than three weeks to go.

Ian Lavery, Labour’s chairman, is being blamed for over-ruling fears raised by some of the leader’s allies over the wisdom of hosting the festival, officially titled Labour Live, on June 16.

The recriminations include accusations that party staff bungled approaches to potential acts, including Stormzy, and booked the venue before nailing down a compelling line-up.

A week ago it was reported that only 2,500 of the 15,000 seats at the White Hart Lane recreation ground in north