This black-and-white film manufacturer can trace its roots back to 1879 when photography pioneer Alfred Harman began to make dry plates, a forerunner of film, at his home in Ilford, Essex. Known as Ilford Imaging for more than a century, it became Harman Technology in 2005 when it was rescued from administration. It sells black-and-white film, photographic paper and single-use cameras and accessories. Acquired by venture capital firm Pemberstone in 2015, profits grew to £3.1m in 2018 under managing director Greg Summers, 47. This month it suspended production, although its warehouse remains open for distribution.