That's "Rafe," not "Ralf." Rrrrafe. Roll your "r": R-r-r-r-r-rafe.
On a fansite for Ralph Fiennes, there's a "Poetry Corner" page, which collects recordings of the actor reading all sorts of verse, from Shakespeare to Kipling to Pablo Neruda. This, in itself, is not surprising.
But I was left completely nonplussed to discover Ralph Fiennes reading "Naming of Parts" (.mp3). He does the two voices, and everything! Just when you thought the Internet wasn't, y'know: good for stuff.
The poem appears under a section for BBC Radio 4's program, "Poetry Please," so I have to assume this to be the recording's origin. The section also includes Fiennes's interpretations of Keith Douglas's "Vergissmeinnicht," and John Gillespie Magee's "High Flight."