Lolly I’m so very sorry - I have been there many times, and know the disappointment of an uncooperative lining. There are many different strategies to try - I don’t know why they’d say there’s nothing else they can do for you, you and your Dr may need to tinker with different approaches to try and find the right formula, and think outside the box a little. My Dr says some women don’t respond well to artificial oestrogen, but do respond when they have their body’s own oestrogen in the mix as well. So it could be that light ovarian stimulation (i.e. to grow one or two follicles to produce natural oestrogen) plus prohynova and / or oestrogen patches, could be a better combo for your body. Viagra pessaries can also really help many women. A mixture of different kinds of oestrogen can be useful - patches and vaginal administration can be more effective than oral progynova. The neupogen wash might nudge you over the line to the magic 7mm. Big hugs - it’s so hard. I feel like everyone else seems to find a FET a doddle, it seems everyone else grows lush plump linings really effortlessly - whereas for me just getting to a transfer is a huge mountain to scale, let alone getting a BFP.
Again cautious and hopeful congratulations - and likewise to CSA 
(are we ALL Londoners - albeit I’m the lone one north of the river?!)
bear excellent news on the scratch - TICK
AFM, sadly my birthday came and went with no period - my first cycle of HRT plus the copper IUD post hysto has been a total washout
We agreed it was too early to write anything off yet after just one month, and we've added in oestrogen patches for this month on top of the HRT. But we agreed that if we've still not been able to generate a bleed in 6 months time - via whatever combination of drugs we end up trying - that if it's not happened by then, we would have to accept that it's not going to happen.
If we get to that point, it's very unlikely we would try another FET - because if we can't get a decent enough lining to have a bleed, it's not going to be able to propagate and sustain a pregnancy, and it would be folly to waste our precious embryos.
If we do get me to have withdrawal bleeds then we would do a dummy FET with endometrial biopsies and crack on. But if not, then that's it for my body.
So no FET for me any time in the foreseeable future. Or potentially at all.
Ironically the waiting has been the killer to date. Now I’m terrified the next 6 months will fly by - with no progress - and we’ll have reached the end of the road. By spring latest we will know if there's a chance my uterus is potentially up to the job. Or that it definitely isn't, and that our only chance of having a baby is to transfer into someone else's 😓