As 2012 sees us complete the digital switchover, this two-hour special for ITV1 counts down the biggest rating television shows ever to hit our screens. These days, shows and events such as The X Factor final, football matches and royal weddings still manage to pull in huge audiences. But back in the days of a mere four channels to choose from (or in our case, two), even the most unexpected shows could attract staggering viewing figures, with an episode of Neighbours reportedly pulling in more than 20 million viewers in 1990. You'll never guess which one... Split into four categories, Entertainment; Live Events; Drama and Soaps; and Comedy, TV’s Biggest Blockbusters counts down the top ten shows with the biggest audiences in each section.