The mother of Martha Fernback, who died from a lethal drug overdose at an Oxford park, is at 10 Downing Street today to campaign for drugs legalisation.

Martha, 15, a Cherwell School pupil, died on July 20, 2013, after taking MDMA powder, more commonly known as ecstasy, in Hinksey Park.

Following an inquest last year, when Oxford coroner Darren Salter recorded a verdict of accidental death, Martha’s mother Anne-Marie Cockburn, from Summertown, said she wanted to meet Home Secretary Theresa May about her campaign to promote greater awareness about the dangers of drugs.

That campaigning is continuing today as members of Anyone’s Child: Families for Safer Drug Control lobby Prime Minister David Cameron.

Families who have lost relatives to drugs, including Ms Cockburn, are taking a letter to Mr Cameron.

Ms Cockburn said: “We are delivering the letter this afternoon – it’s an international project.”

Campaigners are calling for a new way of dealing with illegal substances and are urging the Prime Minister to commission an independent review of UK drug laws.

The letter says: “We are a group of ordinary families who have joined together because we share the grief and sorrow from having loved ones who have been hurt by our failing drug laws.”

It adds: “We have come to the conclusion that not only do our drug laws harm and kill, but that legally regulating drugs through pharmacies and doctors, rather than street dealers, would have better protected our loved ones.

“In fact, some might still be alive if drugs were under strict government control.”