Hi I’m a tattooist who tried to get into Glastonbury festival to tattoo and they said it’s not something they want there. Other festival do do it and as a tattooist I know it’s possible and legal to do so, it’s just a matter of choice for the people running Glastonbury festival. All tattooist take health and safety very seriously and it’s perfectly save to do so in a licensed van and using second skin to cover the tattoo for the duration of the festival, keeping it clean and germ free. :)