Private MRI scan

I've been diagnosed with a recurrence of Ovarian cancer. I've been told I need an MRI before determining treatment. After 2 weeks I still don't have an appointment- have chased. No one seems willing to talk to me about private care although I've asked several times. If I get a private MRI will NHS look at the images? Any tips or advice on how I can make the right decision or speed up the appointment? Thanks in advance.