A teenage schoolboy told his mother, “I love you mum, I promise I won’t die,” before attending a rave where he apparently took a fatal Ecstasy overdose.
Daniel Spargo-Mabbs, 16, died in hospital two-and-a-half days after falling unconscious at the music event, which was held on an industrial site at the weekend.
Police on Tuesday arrested two men, aged 18 and 19, on suspicion of supplying controlled drugs in connection with his death.
The teenager’s mother, Fiona, 46, said her son had an “adventurous spirit” but had never taken drugs before and knew the risks of illegal substances.
"My boys are the loveliest boys in the whole world. I know every mum says that but mine really are. And I just don't know how I am going to go on,” she said.
Mrs Spargo-Mabbs recalled hearing the mother of murdered schoolboy Jimmy Mizen say she felt comforted to have given her son a hug and a kiss before he left the house on the day he died.
She said: “After that I always did the same with my boys and it became an in-joke. Danny always used to say, ‘I love you too mum, I promise I won't die’. And that’s exactly what he said when he went out on Friday.
“He didn't keep that promise. But he didn't know - if he had known, he wouldn't have done it.”
Daniel, a sixth former at Archbishop Tenison's Church of England High School in Croydon, south London, had asked his mother for permission to go to a party on Friday night, but in fact went to the rave in Hayes, west London.
He fell unconscious at about 4am on Saturday morning and was taken to Hillingdon Hospital with a temperature of 42C (107F) having suffered a suspected drugs overdose.
Mrs Spargo-Mabbs, an adult education manager at Croydon Council, said it was her “worst nightmare” when the police knocked on the door at 5.30am to say that her son was in hospital.
She and her husband, Tim, 50, who works for a Christian charity, rushed to the hospital, where they found Daniel fighting for his life in intensive care.
"He just looked awful. He did drama at school and I half expected him to sit up and say, 'I fooled you', but he didn't,” she said.
The schoolboy, who had dreamed of joining the Army and becoming an English teacher, was transferred to a specialist unit at King’s College Hospital in south London but died at 12.50pm on Monday.
Richard Parrish, the headmaster of Daniel’s school, a well-regarded comprehensive with a strong Christian ethos, described him as a “bright, articulate, talented” student and said the world was “poorer without him”.
Afternoon classes for the sixth form were cancelled on Monday after the teenager’s death was announced.
Mr Parrish said in an emotional statement: "Our heart goes out to Daniel’s family, to his parents, to his brother Jacob, who did his A-Levels here last summer, and to his closest friends.
"To them we want to say the same as we are saying to ourselves: that what has happened to Daniel is not normal.
It is not normal that a bright, articulate, talented 16-year-old should be taken from us in this way.”