He wrote, produced and directed The War, a cinema short, starring Colin Welland and Eric Burdon (15 minutes, B&W 35 mm Panavision).
He wrote and directed Everybody's an Actor, Shakespeare Said, a documentary on the work of Joan Littlewood, with young people in the East End of London (35 minutes, 16 mm Eastmancolor).
In 1971, he wrote and directed Private Road (86 minutes, 35 mm Eastmancolor), starring Bruce Robinson, Susan Penhaligon and Michael Feast.
[3] In 1972, Platts-Mills was made a Governor and Honorary Life Member of the British Film Institute and Director of the Prodigal Trust, Inner London School's video project.
After two years' preparation he directed Hero (82 minutes, 16 mm Eastmancolor) for Film Four in ancient Gaelic with actors drawn from a Glasgow youth gang.
Platts-Mills was advisor to the development of Wornington Green Residents' Association Video Project for disadvantaged youth in 1993, and in 1994 he set up and supervised the first year of the North Kensington Video Drama Project (NKVDP), including work for the Metropolitan Police Scam scheme and the Youth Enterprise Scheme.
In 1995, together with students from the NKVDP he established Massive Videos at North Kensington Community Centre and worked on the development of Courttia Newland's The Scholar.