I am a bit biased since O'Brian is one of my all time faves
but in the interest of completeness I believe Angelica Fox hailed from Ireland. There was also another Angelica from the 90's who hailed from Dublin. O'Brian and Phillips are the bomb though...O'Brian's accent is less pronounced than Phillips', she could pass for a Brit fairly easily. Also deserving a mention (all hail from Ireland):
Paula Murphy, Dawn Phoenix, Lucy Kent, Nicky/Nikki Pearce, Jenny Mae, Antoinette Cordell
Phoenix has an old yahoo group