Into the Wardrobe

Just as a guess, I would think that Lewis would have preferred the New Testament in Greek (and perhaps the OT as well, in the Septaguint translation). In English, I doubt that he would stick to one translation, particularly if he was investigating a specific point. As one trained in scholarly methods, he would have consulted several versions.

I have a Moffat NT. I like it.

I would guess whatever Lewis thought about higher criticism in literature in general would be what he believed about higher criticism (e.g., TR vs. N/A critical text) in Scripture. Given what views we get of his ideas of Biblical inspiration and the like in [i]Reflections on the Psalms[/i], I rather think he wouldn't get too upset either way about the critical texts.