"Words that make the air bleed"

1978! Never heard of this - session? guest appearance? interview? Doesn't seem like the sort of thing Capital Radio used to go in for. I think the estimate of the number of people who'll be listening in is rather inflated... that would be literally every single person in Greater London, at that time. I mean, yes, "eight million people can listen" to The Pop Group, but are eight million people…