Hi Briss,
UCH (RMU) only sees NHS patients, not private ones. RMU works hand in hand with CRGH and some of the doctors work at both clinics. The nurses, however, do not cross over. If you have treatment at RMU your initial consults will be there, as will your scans and blood tests. Any blood tests and scans that need to be undertaken at the weekend will be undertaken at CRGH as RMU is only undertaken Monday to Friday. Your egg collection and egg retrieval will be undertaken at CRGH. Furthermore, your meds will be directed by the doctors at CRGH not by the doctors and nurses at RMU (RMU give them your scan and blood results, the CRGH doctor determines what change should happen to your meds and the CRGH nurse rings you and tells you before 8pm that evening).
The contact with doctors at RMU is rather limited to say the least. I saw a junior doctor for my very basic and brief IVF consult about four months prior to my treatment starting. That was simply to tell me about the IVF process in broad terms (nothing I didn't already know) and wasn't able to deal with the specifics of meds etc as that isn't decided until much closer to when your treatment starts (sometime between day 1 and day 14 of the month in which you start down regulating for full IVF) and is set by CRGH in any event. Apart from that, aside from being scanned by doctors a number of times (when they often did not have time to talk due to the back log of patients to be scanned - I wanted to ask some important questions once and the consultant held up her list and said "sorry, I can't answer as I have all these people to scan in the next hour...") I never spoke to another doctor about my treatment until the day of egg collection. I was told what meds I would be on by the IVF nurse at RMU who will not be able to answer any detailed questions about why you have been put on a particular protocol because it had been set by someone else.
RMU is a bit chaotic and disorganised, but then again so is CRGH. When I reported to reception at CRGH for my egg collection I was left waiting in reception for 90 mins as the receptionist forgot to tell the surgical team that I'd arrived!
Feel free to message me if you have any more specific questions.