Personal note: I, too, am Anglican, here in the UK (many years in Durham, now in Berkshire), and with charismatic sympathies.
He respects Collins; he has been taught by McGrath; he will have been exposed to real theological debate in training. You are actually in a really good starting position!
As with the other respondents, I would emphasise the theology and biblical hermeneutics over the science. The science can be a distraction.
You could point him towards McGrath’s “The Dawkins Delusion”. There is also Collins’ “The Language of God”.
But even above those, I would very strongly recommend Peter Enns “Inspiration and Incarnation”. Enns is an American Hebrew Bible (O.T.) professor, whose roots are strongly in the evangelical side of the church, and who is also Episcopalian (i.e. Anglican). Enns’ books are semi-autobiographical, and he often refers to his own struggles as his OT scholarship opened up some very awkward questions. For him the major turning point, which meant a complete re-evaluation of his understanding of scripture, was 1 Cor 10:4 “…they [the people in the Exodus] drank from, the spiritual rock that accompanied them…” That may look innocuous on the page, but it goes far, far deeper into how Paul did his biblical interpretation. Enns’ faith survived that shock, and was deepened and enriched by it. I really do recommend this book.
By the way, if the conversation drifts towards human origins, Adam & Eve, original sin, the Fall, Paul’s “first and second Adam” etc. it’s probably worth saying "hold that thought, we’ll come to it later; first we need to do ‘Inspiration and Incarnation’ to cover the groundwork. Just as I wouldn’t attempt to teach a five-year old multiplication without the groundwork of addition, nor an A-level student Einstein’s gravity without the Newtonian groundwork, nor Picasso’s perspectives before classical “vanishing point” perspective, then neither would I attempt those theological human origins questions with the “Inspiration and Incarnation” groundwork.
If he wants to look at science, then here in the UK he might also look at Christians in Science. The southern annual conference is usually in October in Oxford (I sometimes lead the songs and hymns); the northern one is in Spring.
Hope that helps. Feel free to contact me outside this forum if you wish.