Some more important events.
I recommend you make up your own timeline of the BBC, where you will place events which you think are key. Here are a few dates taken from the BBC online history feature « on this day ».
1953 The day the House of Lords vote their approval for the introduction of commercial TV
1975 BBC presenter Ross McWhirter assassinated
1983 TV cameras introduced into the House of Lords (the House of Commons agreed later, but this decision showed a new view of what lawmaking should be, and what broadcasting should be.