There is a gorgeous four page spread of Matthew Macfadyen and Stephen Mangan in the Sunday Times Culture (thanks to Lorna for spotting and sharing!). Among other things, it discusses how the two are preparing for their roles in the play.
I say roles, because Matthew Macfadyen is playing more than Jeeves. He will also be playing several other characters, including a few wearing heels-- yes, even the female characters).
Perfect Nonsense opens in Richmond on October 10 the before moving on to Richmond and then the West End.