Old bill in doing their job shocker

That actually looks like an interesting video, but from the few minutes I watched appears to be about the right not to self-incriminate.

You might need to watch the whole video - it is, of course, aimed at an American audience, but the basic points remain regardless of the jurisdiction - as both the lawyer and the officer make clear, yes you have to be a little bit silly to co-operate with the police (here by co-operate I mean - speak with - supply information and so on).