It’s a Detective Agency and Everyone’s English

In It’s a Detective Agency and Everyone’s English, seven inane detectives are English, but they do not have convincing English accents. They break into song but they are not songbirds. They are swamped with cases (the Case of Salt vs. Sugar, the Case of the Wrong Number, etc.) and though they are very busy working on all of them, none of their cases get solved… until now.