The end goal for VANZ is RNP 0.1 but that is stage 3. Need 30 vmc approaches of RNP AR, then 300 more to a higher minima than the 0.1.(3000ft or something like that). Once these proving flights are done they will be granted approval for 0.1 minima.
Like Sqwark said the RNP 0.3 approach is able to be flown by virgin but the GNSS and AR are completely different in how they are designed and flown, not to mention the equipment required that an ATR doesn't have.