They play in the Western division of the Greater Ontario Junior Hockey League (GOJHL).

Paul Duarte is the current owner of the London Nationals, with Tony Mandarelli serving as general manager and Brandon Prust as the team's head coach.

The Nationals play their home games at the Western Fair Sports Centre.

In 1956 the 'Big 10' was divided, and London became a member of the Western Ontario Junior "B" Hockey League.

The team's time under the Diamonds name was successful, as they claimed the Western Ontario Hockey League title in 1981, 1983, and 1984.

In the summer of 1998, the team was sold again, this time to the Doug Tarry Group (London Knights).

The team remained playing at the same arena, but the name had changed to the London Ice House.

The London Gardens (see article) was built in 1963 and served as the home of the Nationals from 1963 to its closing in 2001.

The team adopted similar colours to the Knights (Eggplant & teal) in the 1990s to look more like their Jr A affiliate.

The Knight's move to more modern colours in 2002 brought the Nationals' look back to the familiar blue & white look.

Today's uniforms mimic the Maple Leafs look, adopting a blue, white & black colour scheme.