 Individual episodes were sent to Australia by the BBC in the form of one 16mm black and white film print.If simultaneous broadcast was required (i.e.the same episode scheduled in two different cities on the same date) the ABC had to make copies and send them to the relevant stations for local transmission (until the late 1960s the national broadcaster wasn't networked and regional variations – both between metropolitan areas as well as between metropolitan and non-metropolitan areas – remained commonplace until as late as the mid-1980s.