This is a good website for older videos (pre 1970) I put the link in that thread but I'll repost all the info here, just follow the links to get free downloads (I think you have to pay for full length, but I just have the downloads and they are good wrap-ups), you have to search around on your own though
British Pathe
http://www.britishpathe.com/
I can't make direct links but so far I have found
-King George VI funeral procession
-Coronation of 1936 procession back to Buckingham from Westminster
-Elizabeth II Coronation proclamation
-A lot of clips of Elizabeth II coronation