Can I use a female British voice? Can we use Siri voices?

Is there any way to use a British female voice with speech synthesis? Can we use the siri voices? I notice the siri voices sound much better than the standard voices available through speech synthesis.

I second this and would like to know if we can use Siri apps inside of the apps we are building. Siri sounds much better than even the premium voices that we have access to.