Hello. I go to the ERI too. After I was referred (while I was waiting for my appt to come thru) I had some bloods and scans done privately, and as a result had been diagnosed with pcos and started on clomid.
So at my first ERI appt I was already part way thru a clomid cycle. They had a long chat with me and my OH, asking about medical history etc. As hubby's SAs had come back normal they focussed on me really. I was given an internal ultrasound that day to check if I'd responded to clomid, and how my lining was looking, and they ordered me a HSG to check my tubes....that appt took a couple of weeks to come through.
It could be different depending on what your issues are, but they do seem to get going quite quickly (which is a relief after waiting so long for the appt!). And the staff, nurses in particular, are lovely.
Good luck!