Casting HBP new characters... beware a spoiler!

[Annette]

Any thoughts on which actors are 'right' for the role of new Potions 
master Horace Slughorn yet? I now it's all a bit in the future. But 
did you have any particular actor in mind when you read the part?

Rotund and bewhiskered, I pictured a bumptious old man, I had in my 
mind Joss Ackland. He'd be a comtemporary of DD, therefore akin to 
Michael Gambon.

Annette.