Mrs Okafor, we moved after round two, and the afternoon that finally made the decision possible was much duller than all the evenings on websites. Let me hand you the boring version.
First, ignore the numbers on the clinic sites entirely for now. They are not comparable to each other. A clinic's own figure might be a pregnancy rate rather than a live birth rate, per transfer rather than per cycle started, averaged across all ages, in a year it chose. The regulator publishes results counted the same way for every clinic, along with what each one is licensed to do and its inspection status, and that is the list to start from rather than a search result. Then, when anyone shows you a percentage, ask the three questions: per cycle started or per transfer, pregnancy or live birth, and whose results, the whole clinic or my age band.
Second, and this is the part that surprised me: a high headline rate can mean a clinic is selective about who it accepts. A centre that takes on older patients, complex diagnoses and people arriving with two failed cycles behind them, which is you, will publish lower numbers than one with tight criteria, and may be exactly where you should be. So the useful question is not "what is your success rate" but "how do your results look for someone my age with my history, and how many cycles like mine do you run in a year".
Third, the unromantic things decided it for us in the end. How far is it at 7am, since you will be doing that journey repeatedly for scans. Is the lab on site. Who answers the phone at 9pm on a Sunday. Is counselling offered and included. And an itemised costed treatment plan from each place, compared line by line, because the "from" prices told me nothing useful. I have put the whole checklist in how to choose a fertility clinic.
On the feeling of being a slot in a diary: that is a real thing to weigh, not a soft one. You are about to spend months of your life in this building.