Hi, if you go on the HFEA website there is a postcode search so you can find out what clinics are in your area. We live near Walton and are just starting the whole IVF thing, we are going with the Victoria Wing at the nuffield hospital in Woking. We are private for this cycle but if it doesn't work, in a year we'll be entitled to NHS treatment which can also be done there. It's really close to my work which should be convenient when the frequent scans kick in. Have only visited once so far, to have blood tests and a pelvic scan, but so far so good, really impressed.
It's a very personal choice. We're at Create in Wimbledon. They don't have the highest success rates in London, but their low intervention, more holistic approach appealed to me. ARGC has high success rates, but throw every drug in the book at you and have you in daily for tests. It would have completely freaked me out (I hate doctors and being prodded and poked!), but other people swear by their methods. So different clinics suit different people.
The HFEA website is a good place to start but a bit daunting if you include the London clinics as there are so many.