He will be rebuked for it but it wasn't deliberate, it just slipped out as has happened before a number of times on live TV, Bruno has said some dodgy things when he got carried away. I'm sure it wont happen again.
When I mentioned the over-reactionary brigade it was the calls for Len to quit I was talking about not the use of the F word, which is unacceptable on a family show, even if hardly anybody heard it on this occasion.