starring Alexis Denisof, Amy Acker, Andy Hallet, Charisma Carpenter, David Boreanaz, J. August Richards, James Marsters, Mercedes McNab, Stephanie Romanov, Vincent Kartheiser (add more)
Updates: 
Series 1
Continuity: In the season 5 episode 'Destiny' we see that the first time Angelus meets William, he has already adopted a more cockney accent, but in an earlier episode of BtVS (Fool For Love) Angelus asks Spike "Since when do you talk like that", suggesting he changed his accent after they met.
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