A TEENAGER died in her sleep at a Hampshire music festival after taking a lethal cocktail of drugs over a four-day period, an inquest heard.

Olivia Christopher, from Chesham in Buckinghamshire was found unresponsive in a tent by her boyfriend Daniel Holmes at BoomTown Festival near Winchester on August 15.

Pathologist Dr Balvinder Singh Shoker said there was toxic levels of MDMA in the 18-year-old's body and also a significant level of sleeping pill etizolam.

During the festival Livvy, as Olivia was known to her friends, had also taken ketamine along with cocaine, ecstasy and LSD - however these were drugs were found to be at 'recreational' level.

A friend at the festival told the inquest she was in a "bad state" on the first night of the event but appeared to be fine on the Sunday night.

The inquest heard how Olivia arrived with her boyfriend Daniel Holmes and they joined other friends who had arrived with drugs, and also paid for drugs on site.

Mr Holmes described Olivia as healthy but said she was taking variety drugs throughout the festival and he was surprised at how much she took.

"It was small quantities, she was taking a lot of thing things in small doses throughout the days,.

"She also drank alcohol too, which was mostly wine," said Mr Holmes.

"To be honest I did not think they (the drugs) had that much effect - she seemed to be in full control and knew what she was doing."

Senior coroner Grahame Short recorded a verdict of a drug-related death.

Mr Short said: "The evidence is very clear that Livvy took a series of different drugs while she was at the site.

"Given the history, I get the impression Olivia could take large quantities of drugs without being aware of the consequences. She felt some form of invincibility."

The death of Ms Christopher was the fourth in the festival's seven year history.

In 2011, Deborah Jeffery, 45, from Winchester, suffered a fatal heart attack after taking ecstasy; in 2013, Oxfam steward Ellie Rowe, from Glastonbury, Somerset, died after taking ketamine; and in 2014, Lisa Williamson, 31, from Hereford, was found hanged after using drugs.