www.the-leaky-cauldron.org states:
Mme. Maxime and Mad-Eye Moody Cast
The BBC has confirmed with warnerbrothers that Madame Maxime will be played by 1970s sitcom star Frances de la Tour, while Mad-Eye Moody will be played by Brendan Gleeson, most recently known for his work as in Troy, as Orlando Bloom's character's bitter rival.
---
The casting of Brendan Gleeson is fabulous! I remember him mostly as Frank from 28 Days Later.
I must admit, I'd been harboring a hair-brained scheme, resulting from my annoyance over Rik Mayall being cut out of the series as Peeves. (Maybe they'll put him in the 4th movie, otherwise how will they adapt the Egg scene on the stairs?) I wanted Rik to play Mad-Eye, you know, all built up and wearing prosthetics and stuff, and then at the end he could play Barty Crouch too.
But the casting of Brendan is just too good, so I surrender my pathetic dream.
I just hope Rik finds his way into the movies somehow!