> The question asked was about Britain's recovery so for him to say 'Never mind….' there must have been a question referring to health interrupting his response
If you watched the video, you'd see that Boris actually interrupts the interviewer to say what it is he wants to say, rather than wait for the question. The interviewer then gives him time to say it. No interruptions. And after two "Erms" - uninterrupted - to gather his thoughts after he's started a sentence with "Never mind", Boris comes up with "you know, cancer outcomes" to finish the sentence. That's what I see.