I agree, well done for getting this far! My experience is London based, and also pre-covid, so timelines etc would be completely different.
I ended up paying for private gynae checks abroad out of sheer frustration with the NHS and nothing being done. (I worked abroad several months of each year then). At that stage, I'd TTC 4yrs, and all they'd checked was a day 21 blood which was normal!
Anyways, I returned to the UK with hycosy, semen results, blood tests, STI checks etc. When I finally got to the fertility specialist clinic, (Guys hospital) the very 1st thing they did was have a nurse check weight and height. They did not further tests to what I'd had done abroad though.
I then met the consultant who discussed both our medical histories, any previous pregnancies, my cycle, any gynae problems, surgeries, medications etc. She also asked about our jobs, whether my DH had ever used steroids and if either had previous STI's.
Check closely what the requirements are in your borough/area to qualify for IVF. I too, was only allowed 1 cycle, BUT, they have specific BMI requirements. Some area have requirements about smoking, age, partners smoking etc, so do check.
If you are anywhere near the upper BMI limit, wear light clothes to the appointment. I wore jeans, a metal leg brace, top and jumper and assumed I'd be able to at least remove my leg brace before being weighed! They weighed me with everything on!
In the end, I did need to lose some weight, but was several kgs lighter without a jumper and leg brace on! Once I'd lost the weight, I think it was maybe 2mths to see them again. I had that 1st IVF round last year- the week we went into the 1st lockdown.
Unfortunately things didn't work out, nor did a 2nd round we had at the end of last year. If you have any questions at all, I'm happy to answer them.