Ana Bort via Flickr CC
It might be very much in the ‘just in case’ corner but The Regency Act 1937 is a powerful document that decides who controls the Crown if the Monarch is either unable to carry out their duties or if the throne passes to a child. And the Act that sets the stall out in the 21st century is rather different from previous provisions. For until the early 20th century, it was presumed that if a royal under the age of 18 needed a regent, mother always knew best.
There were no general laws around regencies until the early 1700s with monarchs deciding who controlled the Crown if they were absent or if a child should inherit the throne. As Parliament’s power grew, that began to change. The House of Hanover saw a string of acts around regencies passed.