So he answers, "No of course I cannot offer such an assurance that it could never happen again but that's why we've initiated a review into why it happened, so that we can make the processes more robust. You had 14 years to do that, and didn't".
Cartlidge now either has to persist with a supplementary about an issue that he's pretending not to know about, or he asks about something else. He's wasting the chance to ask about a different topic.
Personally I think Lammy should have answered, but any outrage that he didn't is misplaced. Maybe some posters here are too young to remember when terrorists were escaping from prison ...