The longest interview with Andy Redwood that I could find was on Daybreak in 2012:
Q. Do you believe she's still alive?
A. Yes, I do.
Q. Why?
A. I believe she's still alive because, in the beginning of this case, it's been a great privilege for us in the Metropolitan Police to be part of this review, we came to this investigation with completely open minds, untouched by anything that has gone on before, and as part of that, two key elements are, one; Madeleine is alive & two; sadly she is not. In relation to her being alive, yes, there is a real possibility that she is alive.
Q. So what the reasons you think that, becuse I think we're all clinging to the hope, aren't we? Yes,is there hard evdidence, because there's still going to be hope, as long as she's not found?
A. Yes, we have conducted a forensic analysis of the time line & there is clearly an opportunity there for Madeleine McCann to have been removed from that apartment alive & it's our belief based, as experienced investigators, on the evidence, that it's a criminal act undertaken by a stranger. (Quick transcript of main points)
http://www.youtube.com/watch?v=-R_RjWWCKEA