That is obviously an excellent question. I actually have the study before me and would be happy to leave it with the committee. It's a valuable study, done by Jeff Nisker and his colleagues. I do want to clarify what it was: 45% was a non-response. So we don't know what they would have said. It was kind of like a survey. Still, I think Professor Baylis's points are important.
In some respects, you answered your own question by saying that people move on in their life. Their perspectives may change. That, in many respects, is the very reason you need to go back and reconsent.
I think, really, if you look at other ethics contexts, it's standard practice to reconsent in these kinds of situations, whether it's biobanking or other kinds of clinical research. So I think it can only increase trust and increase certainty in the consent process.