All work and no television would make Johnny a dull boy.
Steel Radar Fury is a science fiction, New South Avenue is a soap opera, and Bella & Bethany is a variety show that almost everyone in Johnny’s world watches.
The Mets are a real British baseball team (the London Meteorites, not the Metropolitan Police). The Hercynia Halberdiers are fictional, though.
If this chapter seems to portray baseball in a less-than-flattering light, please bear in mind that very few people in the present day UK care about the sport, so Johnny’s interest suggests that it is more popular in the world of the story than it is in real life. In the real world, British baseball is actually experiencing a decline in popularity.
British baseball has slightly different rules from regular baseball, but in the world of the story, I think they play by the American rules.
Gong xi fa cai!