Casanova aired in 2005, but I don't know when it actually shot. I can't remember whether HKHWR's original airing in the UK was also in 2005, or was 2004.

I like him with his natural chestnut color, m'self. The texture of the hair in Casanova leads me to believe that not all of it is his - assuming the whole thang isn't a wig.

This makes me wonder at what point his hair naturally starts to go curly - assuming it wasn't styled into this look - since he's had at least the top almost that long both on Who and at the RSC.