The 1970s era of female dealers, DIY harm reduction and the baton-wielding Special Patrol Group (SPG) was a very different one to the pizza-style deliveries, labyrinthine drug services and violence of 21st century drug culture. Max Daly talks to Rick Rutkowski, a user in the 70s, and current user Erin O’Mara about 30 years of changes at street level.