Fitzwilliams says the relationship between William and Kate shows just how much the monarchy has changed in recent decades.

Diana was only 20 years old when she married into the royal family. Up until her wedding day she referred to Prince Charles as ‘sir’ and even her sexual history was a topic of public concern.

Changing times

This year’s bride is another story altogether. Kate is 29 years old. She has a university degree. And she and William have lived together on and off for the past 10 years.

Fitzwilliams says the different brides reflect a changing Britain.

"The relationship between William and Catherine is a very modern relationship," he noted. "What is particularly significant is that this is the first time that the heir to the throne of Britain can actually choose his bride regardless of class."

Collector Robert Opie says the popularization of the royal family can be seen in this year’s royal wedding souvenirs.

Unofficial souvenir condoms of Britain's Prince William and Kate Middleton are seen in London

A romantic fiction graphic novel is on display at his museum. Royal wedding beers, condoms, and sick bags have also been specially made for the event.

"At the moment I’m seeing more souvenirs that have a little bit of an edge in terms of a feeling of alternative monarchy," Opie said. "So it’s a little bit more edgy in the way that it’s portrayed."