Thanks ladies, you guys are the best. I'm really really touched. Thank god for the barren ghetto!!
Saw my lovely fertility consultant yesterday. He said a cytology report is pretty rudimentary vs histology reports where we've done curettage and taken endometrial tissue and are looking at directly sampled tissue, so it was very unlikely anything sinister was going on that three histological analyses had missed. I'm at the NHS gynae-oncology clinic on Weds - said I should have the smear repeated and potentially a pipelle biopsy done (and colposcopy if they offer it, although it's unlikely to tell us anything as the smear itself was normal), but we agreed I wouldn't consent to another D&C. He said if they weren't helpful he would refer me to a colleague who specialises in gynae-oncology to liaise accordingly (BUPA definitely covers cancer and general gynae - they paid for my ERPC and both hysteroscopies, so a private follow up is eminently possible, but will see how we get on with the NHS appt first)
Consultant was relatively untroubled by it, although agreed we couldn't just say 'well it's PROBABLY ok, they PROBABLY didn't miss anything'.
The referral itself was indeed under the 2ww - came from the 2ww team. Unfortunately they count the 2w as being from the referral - and so they don't count the first (wrongly made) referral to the colposcopy clinic - the 2ww team only got the referral when the error was picked up. So my appt in Jan is within 2w of the referral being received. 
NHS Dr is going to get a surprise when I rock up with reports from three operations, three endometrial biopsies and a HyCoSy report. Consultant said I've got one of the most well looked at uteruses in London!!
He was giddy when I told him I'd had a proper period. He practically leapt up out of his chair and actually exclaimed 'that's the best news I've had in ages!'
He got all excited saying if I had a bleed this month we could take the coil out and do a mock cycle with biopsies, and started talking about doing a FET in March. I told him to calm down as that was a long way to go!
Lining this month was looking great, after only 5 days of stims, so I trigger on Sunday. He said that it was very clear artificial hormones didn't work for me - but that with ovulation induction we seemed to have found a better formula. So we shall see.