I've just added Dr Who to my television timelines project. It only includes the major characters (basically the Doctors and his companions), and is accurate to within a year. I may add more people and more accuracy later, as the details are readily available from a multitude of sites.
I may also get more motivation after watching further episodes. The ABC are currently showing mid 1975, the start of Tom Baker's tenure. There are still a number of upcoming episodes that I was too young to see when I was growing up in England.