In a morning timeslot when most respectable Glastonbury-goers would usually be in bed, Irish-language rappers Kneecap drew what stage organisers described as a headline-worthy crowd to the area.

The trio have built a name for themselves with a balance of socially conscious lyrics and satire but have really come to the fore in recent months after taking legal action over a UK government decision to block funding they had been granted by the British Phonographic Industry…