It's always daunting choosing your first clinic if given a choice. Read up on the clinics and their success rates on the HFEA website. You can also check out the clinic boards on the Fertility Friends website and look to ask people who are currently being treated there. Good luck!
I've been seen in St Albans recently. First appt with a nurse who brought us back one month later to see Locum consultant from overseas. Not impressed to be honest. Said everything looks normal and to try for another one to two years before coming back. ( we've been TTC for 18 months to date and I'm 30+). I would prob chose elsewhere tbh but obviously mine is only one experience..