Slow is good but I'm going to watch The Changes instead. It has 10 24-minute episodes.
The Changes posits a Britain where a sudden enveloping noise emanating from all machinery and technology causes the population to destroy them. The resulting upheaval displaces many people and reverts society to a pre-industrial age where there is a deep suspicion of anyone who may be harbouring machinery. Even the words for technology are taboo. The remnants of modern technology that escape destruction (such as electricity pylons) produce a physical and sometimes violent repulsion among those left in Britain.
The Changes are seen through the eyes of teenage schoolgirl Nicky Gore (Victoria Williams), and the 10-part series, originally broadcast every Monday from 6 January to 10 March 1975, traces Nicky's quest to reunite with her parents and solve the mystery.