How many people have you interviewed/arranged to be interviewed for television programmes? Of the countless people I have dealt with none of them were paid. Of course, I can't be certain that these guys weren't paid but I can say with relative authority and personal experience that as that programme was made for the BBC it is highly unlikely that they were paid for their contributions.
Is that ok? Would you now like me to scan in my pay slips? Do I have your permission to continue posting or should I run everything by you in the future?