Alex got some very good reviews for his portrayal of the Duke of Windsor in "The Crown".
The Telegraph says he "has a gift for adding an extra dimension to real-life characters, be it Alan Bennett, Anthony Eden or Stephen Spender, and that's very much the case here – his Duke is always far more than an impersonation of the uptight character we’ve all seen in grainy reels of Pathé news footage. Jennings held this episode together. Without him, it would have been a hollow examination of protocol and powerplay seen through a distant, dispassionate lens."
Full review at the Telegraph.
And a little more about Alex's appearance in the 5th episode at the Telegraph.