Asterimou, I'm really happy to hear you'll give it one more try (still holding out for a surprise tomorrow, but I know it's a long shot...) I know what you mean, though, about the emotional exhaustion. I mean, when you get that BFN it is so crushing... And so many of us have had MC's, too... But the hope keeps us going, to the extent each of us can...
I've only ever researched London clinics, but am very happy to share my thoughts. From the HFEA website, it's clear that ARGC has the highest success rates by a mile. They are also eye-wateringly expensive. But that's not what kept me from them... It's more the fact that they continually get told off by the HFEA for one violation or another. It all centers on this one guy, who really does appear to be brilliant... but all the process failures the HFEA complains about scare me off. Also, the wait before an initial consultation is a couple of months (since it's all based on that one guy's availability). Finally, for a portion of your cycle, they might get you to come in twice a day for a scan (to make sure you don't ovulate). Not sure that's necessary if you're taking an antagonist, though--might only be the case for a natural cycle IVF. So, I'm kind of intrigued by them but have stayed away. If I only had one shot, though... I might go with them. Women who go there complain it has a boot-camp-style approach. That wouldn't put me off, personally, though...
My clinic, CRGH, has, I think, the next best success rates--the difference, unfortunately, is significant. Also very expensive, but significantly less. My consultant is Dr Ozturk, and I like him very, very much. He is careful and conservative both with your wallet and with each attempt, which is crucial if you are only willing to do one. They have a very, very good lab, and excellent practitioners. I guess ARGC's lab must be even better, but I've never had a procedure there that didn't do exactly what it was supposed to (egg retrieval: eggs were always retrieved; ICSI: every egg was fertilised, which is crucial for me because I have so few!) It's important, though, that you take a rather active active approach to your treatment. This means, if you have any questions whatsoever, you'd better ask, because the communication is less than ideal. Also, my doctor has said some things that somehow the nurses haven't picked up on, so I have to be aware of everything that needs to be done. (For instance, last time I went for bloods, the phlebotomist asked if it was just for the Zika virus, and I had to tell her, no, it's also for liver function and blood sugar. But I had to be the one to remember!) Not ideal and actually exhausting, but on the whole worth it. If this FET doesn't work, though, I will be leaving them for a clinic in the US, who is better (I think) at handling women with diminished ovarian reserve. But I don't think that's you!
Other clinics I know more from hearsay. I think the one with the third-best numbers is Lister. I think they're significantly cheaper, but also much, much nicer and warmer--apparently you feel very welcome and you are kept in mind much better. I... am not sure I trust their lab so much, though. I mean, I think it's very good, but probably not as good as CRGH's or ARGC's. There is also Create, but they specialise in diminished ovarian reserve, and I really don't think you've got that. They're way cheaper, but I have big questions about their lab. I've also heard really good things about Guy's, which is both NHS and private, but haven't looked into it--I think they have really good doctors and an excellent lab. Another doctor that has intrigued me is one a woman on another forum has been using: Mr Colin Davis,
https://www.thelondonclinic.co.uk/consultants/mr-colin-john-davis -- no idea how much he charges, but he sounds really really super-good at detective work, and I have to say, in your place I would be quite tempted by that, as you seem to be producing a good number of eggs but then that doesn't get converted... But the lab he works with--I'm not so sure about (it's CRM, and their ICSI numbers are really not great. But I think you don't need ICSI so maybe it doesn't matter?)
Finally, there are the "it's cheaper abroad" choices. I know you've got a Greek connection, so I'll start with Serum, in Athens. Women swear by them--they're excellent detectives. I don't know how good their lab is, though. If your OH is from Athens, though, it might be nice to combine a trip home with a course of IVF? And the other one a lot of London women use seems to be Gennet, in the Czech republic. They partner with City fertility here, so you don't have to travel for absolutely everything, but City does not have the best lab.
I'm sorry I'm flooding you with information. Many clinics have open days or evenings, and that might be a good choice to get a feel for the clinic without having to have the (paid-for) first consultation. If you want to spend some time on the HFEA website, it's here: https://guide.hfea.gov.uk/guide/AdvancedSearch.aspx
Sorry I cannot be more directive... I feel like you should have gotten a much better result, though, given your antral follicle count. I'd also push for a day 2 or 3 transfer next time--your main problem is your blocked tubes--maybe your uterus is the best place for your embryos, rather than the lab...
Anyway, Asterimou, I'm really really sorry.
I still hope tomorrow you get a different result. If you don't, you will survive this disappointment... And I hope your next attempt is better--you get an excellent doctor, an excellent lab, and get your pregnancy and your baby after all!
Feel free to ask anything you like! I hope I haven't flooded you too much!