If any major label were nonplussed about the promo video as the 1980s arrived, the purse strings would be loosened for big-budget music videos sharpish the moment MTV made its pop-cultural waves. Momentum was building over the previous years. Before David Bowie set a new standard for ‘Ashes to Ashes’ $582,000 production in 1980, a steady tradition of promo clips held more of an established practice in the British music industry, largely down to …