I see so many posts of the Union Jack without one of the countries

Flag - Wikipedia

Why does the U.K. have two flags? - Quora

United Kingdom, History, Population, Map, Flag, Capital, & Facts

16 Best Hotels in Bergen. Hotels from $42/night - KAYAK, bergen

Union Jacks for Other Countries

Award-winning fish and chip shop ordered to take down Union flag

Union Jack Flag of the United Kingdom Stock Vector - Illustration

Who is holding on to the union jack?, Australia news

Flags of the World - Berger Blog

A flag I made for a Fictional Country in my Novel! What do you