So the Conservative leader will not, after all, break an election tradition of the Panorama interview with every major party leader since Alec Douglas-Home. And it will be one of the rare occasions when he may face a sustained line of questioning with a large public audience. So what would be the most effective questions for Cameron in this (and any other) major broadcast interviews in the rest of the campaign?
Your comments, tweets and emails please would be very welcome. If anybody has ideas, I'll try to add the best to this post. Here are some quick thoughts from me.
I am still not sure exactly how he would answer a question along these lines:
I know you're very proud about how much the Conservative Party has changed. How much of your manifesto Margaret Thatcher would disagree with?
There are enormous numbers of questions about very odd features of the marriage tax break. But I am not sure the issue of whether £150 makes any difference, or even the message sent to single parents, get to the central mystery of what the policy is up to:
If the aim is to recognise marriage, why would a married couple, both earning £15,000, not get your marriage tax break unless the wife (or husband) gives up work and stays at home?
If anybody has a coherent answer to that one in the meantime, I would be fascinated to hear it.
And it's a bit old now, but I was astonished Cameron got off so lightly with nobody noticing the personal hypocrisy of his mistaken attack on the police last Thursday.
Do you still have the taxpayer-funded Lexus that caused the controversy over chauffering your shoes? Is that a better example of frontline services than the Hull police's crime unit that you criticised in the TV debate?
I am not sure we would get much new information from that.
What else? What are the questions that could elicit new information and put key parts of the argument and policy agenda under scrutiny?