He's referring to CBBC and CBeebies, two BBC channels for kids.I can safely say I've not heard anybody say bastard or shit on there. Tosser would probably be ok on something geared towards older kids.

The only exception being on Balamory where every character refers to Archie as a cunt. The BBC have explained that this use of profanity is excusable as Archie lives in a pink castle, wears a dress and is a cunt.