Can a Limited Company have 100% voting? (UK)?

In Company law, is the 3/4 vote needed for special resolutions like rule changes, dissolution clause, and changes to the aims and objectives, a default ruling, ie., is it a minimum vote level allowed, so that members can if they wish, choose to have a 100% vote, if they want that?, so that if that higher voting requirement is written in to a companys articles, does that take precedence over the statutory requirement of a 3/4 vote?