Rapper, singer and actor, Plan B, has admitted to using heroin once when he was a teenager, whilst at Glastonbury Festival.

The 27 year old explained: "I was 16 and didn't have any money.  The first night we were there, me and my mate popped a couple of pills.  The next night this northerner asked us if he could use our fire and we were too young and too scared to say no.  He got this foil out and started smoking heroin. We started asking him about it and then he told us that he did heroin because he was abused as a child. Then he asked if we wanted some. So, like idiots we took some of his heroin and on the last night we smoked it.  It was the first and last time I ever did it. I'm never going near it again.  My head was spinning like I was drunk.”

Plan B went on to say, "I was hot then I was cold, I was itching all over - it was horrible."

Glastonbury Festival is being held this weekend, running from June 22 to June 26.

See Plan B being interviewed at the Coachella music festival: