The BBC's mission of enriching people's lives with programmes and services that inform, educate and entertain took another knock yesterday when CBBC broadcast episode 18 of The Next Step. Newsround Blog is looking into the controversial circumstances surrounding acquisition of that dire Canadian TV series.

The screengrabs below include the broadcast subtitles.

James tells viewers that his "mom" has taken him out of the studio because she wants him to focus on his "math." His maths grades were slipping.

We then see him chatting to Riley and Chloe via webcam. Chloe explains that "everyone who's a part of A-Troupe has been taking shifts to help James with his math."

Chloe: (via webcam): What is cosecant?

James: Um, the inverse of cosine.

Chloe: Yes

Riley: Good

Chloe: Good job

In fact the correct answer is that cosecant is the inverse of sine - not cosine.

James says "It's important to pass, because if I pass it I get to go back to the studio. And I get a date with Riley."