Now, many of them are huge affairs of the rich, and will not be representative of the average wedding of the time.
But the styles, the flowers, etc are still stunning to look at.
http://www.britishpathe.com/And I searched for "wedding" in the search box. I can't stop looking, and I can't even offer a favorite yet...just wow.
But other movie clips may also have other great period details for people looking for that stuff.